Growth and Development — MCQs

A mother brings her 5-month-old baby to the clinic for a routine pediatric check-up. The pediatrician observes that the baby actively looks at his mother's face and responds with interest as she talks to him, showing recognition and engagement. At what age is this developmental milestone typically first achieved?

Q617

A child presents with telecanthus, hypertelorism, antimongoloid slant, and cardiac defects. What is the most likely chromosomal abnormality?

Q618

A 7-year-old child was brought with bow legs and on x-ray of wrist showed metaphyseal cupping, fraying, and widening of growth plates with osteopenia. What is the diagnosis?

Q619

A child with fused carpal bones comes to your clinic. What is the gene associated with Hand-Foot-Genital Syndrome?

Q620

What is the likely age of a child who can ride a tricycle, walk up stairs with alternate steps, but cannot hop?

Growth and Development Indian Medical PG Practice Questions and MCQs

Question 611: A 12-year-old girl has developed breast and pubic hair. The mother wants to know which sign of puberty will typically occur next?

A. Peak height (Correct Answer)
B. Vaginal discharge
C. Axillary hair development
D. Menarche

Explanation: ***Peak height*** - **Peak Height Velocity (PHV)**, representing the maximal growth rate, is the **next major pubertal milestone** after the onset of **thelarche** (breast budding) and **pubarche** (pubic hair development). - In the typical sequence of female puberty, PHV occurs at Tanner stage 2-3, approximately **1 year before menarche**. - This is a highly predictable, measurable milestone that serves as a clinical marker of pubertal progression. *Vaginal discharge* - Mild physiologic **vaginal discharge** (leukorrhea) due to increasing estrogen often begins very early in puberty, frequently concurrent with or shortly after initial breast budding. - While it may already be present or developing, it is a **subtle, less predictable sign** compared to the major milestone of Peak Height Velocity. - It is not taught as a primary pubertal milestone in standard medical texts. *Menarche* - **Menarche** (first menses) is a **late pubertal event** occurring at Tanner stage 4, typically **2-2.5 years after thelarche**. - It follows Peak Height Velocity by approximately 1 year and signals the deceleration phase of the growth spurt. - This occurs well after the clinical scenario described. *Axillary hair development* - Axillary hair typically develops at **Tanner stage 4**, relatively late in puberty, closer to the time of menarche. - It follows both pubic hair development and Peak Height Velocity in the pubertal sequence.

Question 612: A girl presents with microcephaly and a high-pitched cry. Which of the following is the most likely chromosomal abnormality?

A. Mosaicism
B. Trisomy
C. Isochromosome
D. Deletion (Correct Answer)

Explanation: ***Deletion***- The combination of **microcephaly** and a peculiar **high-pitched cry** (often described as 'cat-like') is the hallmark clinical presentation of **Cri-du-chat syndrome**.- Cri-du-chat syndrome is caused by a **deletion** of the distal part of the short arm of chromosome 5 (5p-).*Isochromosome*- An **isochromosome** is a structural chromosomal abnormality where an arm is duplicated, resulting in two copies of one arm and none of the other (e.g., often seen in X chromosome abnormalities like **Turner syndrome**).- This type of structural error does not typically result in the specific features of Cri-du-chat syndrome, which require the loss of specific genes on **chromosome 5 short arm**.*Trisomy*- **Trisomy** is the presence of an extra copy of a chromosome (47 total chromosomes, e.g., **Down syndrome - Trisomy 21**).- Syndromes resulting from autosomal trisomies (like Patau or Edwards) present with different constellations of congenital and developmental abnormalities, lacking the pathognomonic **cat-like cry**.*Mosaicism*- **Mosaicism** describes the presence of two or more populations of cells with different genotypes in one individual, often mitigating the severity of major aneuploidies.- While it can occur with some deletions, **mosaicism** is not the primary mechanism or classification for the specific **Cri-du-chat syndrome** which is defined by the **5p deletion**.

Question 613: A child presents with a right transverse palmar crease, a cardiac defect, survival into childhood, and mild intellectual impairment. What chromosomal mechanism is most likely associated with these findings?

A. Mosaicism (Correct Answer)
B. Haploid
C. Monosomy
D. Trisomy

Explanation: ***Mosaicism*** - **Mosaicism** is the presence of two or more cell lines with different genetic constitutions in a single individual, allowing for a **milder phenotype** of chromosomal syndromes like Trisomy 21. - The combination of classic Down syndrome features (transverse palmar crease, cardiac defect) with relatively **mild intellectual impairment** and survival into childhood with better outcomes suggests **Mosaic Down Syndrome** (mosaic Trisomy 21). - In mosaicism, only a proportion of cells carry the extra chromosome 21, resulting in **less severe manifestations** compared to complete trisomy. *Incorrect: Trisomy* - While **complete Trisomy 21** (Down syndrome) presents with similar features, it typically causes **more severe intellectual disability** and greater phenotypic expression. - The emphasis on **"mild" intellectual impairment** in this case points toward mosaicism rather than complete trisomy. *Incorrect: Haploid* - **Haploid** refers to a cell having only one set of chromosomes (n=23), a state that is **incompatible with human survival** beyond early embryonic development. - A complete haploid individual cannot survive into **childhood**. *Incorrect: Monosomy* - **Monosomy** (loss of one chromosome, 2n-1) for autosomes is typically **lethal in utero**, making survival into childhood impossible. - The only viable monosomy is **Monosomy X** (Turner syndrome), which presents with distinct features (short stature, webbed neck, ovarian dysgenesis) without the characteristic Down syndrome features described.

Question 614: A child presents with micrognathia and low-set ears. These clinical features are commonly associated with which type of genetic abnormality?

A. Amplification
B. Inversion
C. Translocation
D. Deletion (Correct Answer)

Explanation: ***Correct: Deletion*** - **Micrognathia** and **low-set ears** are characteristic features of many syndromes caused by chromosomal deletions, such as **DiGeorge syndrome** (22q11.2 deletion) or **Cri-du-chat syndrome** (5p deletion). - The loss of a significant segment of a chromosome leads to **haploinsufficiency** for multiple genes, severely impacting craniofacial and auricular development. *Incorrect: Translocation* - This involves the exchange of segments between non-homologous chromosomes; while it can cause genetic disorders, it is not the most common genetic mechanism leading to the specific classic combination of micrognathia and low-set ears. - **Balanced translocations** usually do not cause clinical symptoms in the carrier, but can lead to abnormal gametes and offspring with partial monosomy or trisomy. *Incorrect: Amplification* - This refers to the increase in the copy number of a gene or DNA sequence, which is primarily linked to cancer development (**oncogenesis**, e.g., *HER2* amplification), not generalized congenital dysmorphism. - While large segmental duplications (a form of gain) can cause syndromes, specific amplification events are rarely the cause of micrognathia or low-set ears. *Incorrect: Inversion* - This involves a chromosomal segment reversing its orientation; the primary concern is the formation of **unbalanced gametes** during meiosis, particularly with **pericentric inversions**. - Although offspring can inherit unbalanced chromosomes resulting in abnormalities, deletions remain the most common cause for the specific constellation of features mentioned.

Question 615: While evaluating a 3-year-old with short stature, height is measured at 90cm and the lower segment is 45 cm. What is the likely diagnosis?

A. Congenital hypothyroidism
B. Rickets
C. Spondyloepiphyseal dysplasia (Correct Answer)
D. Achondroplasia

Explanation: ***Spondyloepiphyseal dysplasia*** - This child has an **upper:lower segment ratio of 1:1** (45 cm each), which indicates **adult body proportions at age 3** - Normal U:L ratio at 3 years should be approximately **1.3:1** (relatively longer trunk than legs) - Spondyloepiphyseal dysplasia causes **short trunk dwarfism** due to vertebral and epiphyseal involvement - The **limbs are relatively preserved**, leading to a **lower U:L ratio** than expected for age (approaching adult 1:1 ratio prematurely) - This creates **disproportionate short stature** with the trunk being the primary affected segment *Congenital hypothyroidism* - Causes **proportionate short stature** with generalized growth retardation - Would maintain normal U:L ratio for age (1.3:1 at 3 years) - Associated with delayed bone age, developmental delay, and other systemic features *Rickets* - Primarily affects the **lower limbs** with bowing deformities (genu varum/valgum) - Would cause a **higher U:L ratio** (relatively shorter legs) if severe - Does not typically present with this specific 1:1 ratio pattern *Achondroplasia* - Causes **short limb dwarfism** (rhizomelic shortening) - Would result in a **high U:L ratio** (relatively longer trunk than limbs) - Opposite pattern to what is seen in this case

Question 616: A mother brings her 5-month-old baby to the clinic for a routine pediatric check-up. The pediatrician observes that the baby actively looks at his mother's face and responds with interest as she talks to him, showing recognition and engagement. At what age is this developmental milestone typically first achieved?

A. 9 months
B. 3 months (Correct Answer)
C. 2 months
D. 6 months

Explanation: ***3 months*** - This is the age when infants typically develop a **true social smile** and demonstrate increased interest and sustained gazing at faces, especially parents, showing early **recognition and engagement**. - At this stage, the coordination of vision and social interaction allows the baby to purposefully interact with the caregiver (reciprocal face-to-face exchange), often involving cooing and looking directly at the eyes. - This milestone represents a key social-emotional developmental marker in early infancy. *2 months* - At 2 months, infants typically begin exhibiting a **social smile**, but the sustained, attentive engagement, recognition, and responsive interaction described are usually not fully consistent until 3 months. - Visual skills are improving, but fixation is often transient, and recognition remains basic without the active, responsive interest observed in this scenario. *6 months* - By 6 months, recognition of familiar people is well established; this period is often characterized by the onset of **stranger anxiety** and more mature motor skills like sitting unsupported. - This stage focuses more on object manipulation (e.g., passing objects hand-to-hand) and early communication (babbling) rather than the initial emergence of face recognition and sustained social gaze. *9 months* - Milestones at 9 months include advanced motor skills such as the development of the **pincer grasp** and standing while holding onto furniture, as well as complex communication like understanding simple commands. - While social interaction is highly sophisticated, the initial establishment of active face recognition and responsive engagement (the core of the scenario) occurs much earlier, typically by 3 months.

Question 617: A child presents with telecanthus, hypertelorism, antimongoloid slant, and cardiac defects. What is the most likely chromosomal abnormality?

A. Microdeletion (Correct Answer)
B. Inversion
C. Translocation
D. Trisomy

Explanation: ***Microdeletion***- The combination of craniofacial irregularities like **telecanthus** and **hypertelorism**, along with congenital **cardiac defects** (often conotruncal like **Tetralogy of Fallot**), is the classical presentation of the **22q11.2 deletion syndrome** (DiGeorge syndrome or VCFS).- A **microdeletion** is the loss of a small, contiguous segment of a chromosome, identifiable via **Fluorescence In Situ Hybridization (FISH)** or chromosomal microarray, which is the underlying cause of this syndrome.*Translocation*- **Translocations** (exchange of genetic material between non-homologous chromosomes) are typically associated with large structural rearrangements or specific syndromes like **familial Down syndrome**, not the specific phenotype described here.- These features are characteristic of a small, defined contiguous gene deletion syndrome, which is not the primary consequence of a standard **translocation**.*Inversion*- An **inversion** is the reversal of a segment within a chromosome; while pathogenic if breakpoints disrupt critical genes, it is not the primary chromosomal mechanism responsible for the **22q11.2 deletion syndrome**.- Most inversions are **balanced rearrangements** and often have no phenotypic consequence unless gene expression is significantly altered.*Trisomy*- **Trisomy** refers to an extra whole copy of a chromosome (e.g., Trisomy 13, 18, 21), and the resulting syndromes have unique and different facial features (e.g., **Trisomy 21** classically presents with upslanting palpebral fissures).- While trisomies cause significant cardiac defects, the specific constellation of **telecanthus** and **antimongoloid slant** helps differentiate this from common trisomy syndromes.

Question 618: A 7-year-old child was brought with bow legs and on x-ray of wrist showed metaphyseal cupping, fraying, and widening of growth plates with osteopenia. What is the diagnosis?

A. Hypophosphatemia
B. Scurvy
C. Rickets (Correct Answer)
D. Osteogenesis imperfecta

Explanation: ***Rickets*** - The clinical presentation of **bow legs** combined with characteristic wrist X-ray findings demonstrates **metaphyseal cupping**, **fraying**, and **widening of the growth plates**, along with **osteopenia** - all pathognomonic features of rickets. - This condition results from defective **bone mineralization** at growth plates, most commonly due to **vitamin D deficiency**, leading to soft and deformed bones that cannot support normal weight-bearing. - The combination of clinical deformity and specific radiological changes at the metaphysis makes this diagnosis definitive. *Hypophosphatemia* - While **hypophosphatemia** can be an underlying biochemical cause of rickets (hypophosphatemic rickets), it represents the **etiology** rather than the radiological diagnosis itself. - The X-ray changes described are the manifestation of rickets, regardless of whether it's caused by vitamin D deficiency, phosphate deficiency, or other metabolic disorders. *Scurvy* - Scurvy from **vitamin C deficiency** produces distinctly different radiological findings, including the **dense metaphyseal line (white line of Fraenkel)**, **pencil-thin cortices**, and **subperiosteal hemorrhage**. - Clinical features include **bleeding gums**, **petechial rash**, and **irritability**, which differ from the bone deformities seen in rickets. *Osteogenesis imperfecta* - OI presents with **increased bone fragility** and **multiple fractures** rather than the metabolic bone changes seen in rickets. - X-rays would show **thin cortices**, **gracile bones**, and **wormian bones in the skull**, not the metaphyseal changes characteristic of rickets. - While both conditions cause bone deformities, the **metaphyseal cupping and fraying** are specific to rickets, not OI.

Question 619: A child with fused carpal bones comes to your clinic. What is the gene associated with Hand-Foot-Genital Syndrome?

A. BCL6
B. HOXA13 (Correct Answer)
C. FGFR
D. COL11

Explanation: ***HOXA13 (Correct Answer)*** - Mutations in the **HOXA13** gene, a member of the HOX family of transcription factors, are responsible for **Hand-Foot-Genital Syndrome (HFGS)** - HFGS is an autosomal dominant disorder characterized by skeletal defects, including **fused carpal and tarsal bones** (as presented in this case), short digits, and genitourinary anomalies - The carpal fusion is a classic diagnostic feature of HOXA13 mutations *Incorrect: BCL6* - **BCL6** (B-cell lymphoma 6) is a transcriptional repressor primarily known for its role in regulating B-cell maturation and germinal center formation - Mutations or translocations involving BCL6 are implicated in **diffuse large B-cell lymphoma** and follicular lymphoma, not congenital skeletal abnormalities *Incorrect: FGFR* - **FGFR** (Fibroblast Growth Factor Receptor) genes are associated with skeletal dysplasias involving abnormal endochondral ossification - Mutations in FGFR genes cause conditions like **Achondroplasia** (FGFR3) or **craniosynostoses** (FGFR2), rather than the specific carpal-tarsal fusion pattern seen in HOXA13 defects *Incorrect: COL11* - **COL11A1** and **COL11A2** genes encode collagen type XI and are associated with **Stickler syndrome** and various collagenopathies - These conditions affect connective tissue broadly, causing features like myopia, hearing loss, and joint hypermobility, rather than the isolated carpal fusions characteristic of Hand-Foot-Genital Syndrome

Question 620: What is the likely age of a child who can ride a tricycle, walk up stairs with alternate steps, but cannot hop?

A. 4.5 years
B. 5.5 years
C. 2.5 years
D. 3.5 years (Correct Answer)

Explanation: ***Correct: 3.5 years*** - At **3.5 years**, a child typically achieves the milestone of **walking up stairs with alternate steps** (reciprocal stair climbing) - The ability to **ride a tricycle** is typically achieved by **3 years** - **Hopping on one foot** is a milestone achieved around **4 years**, so a child at 3.5 years would not yet be able to hop - The combination of these milestones (can ride tricycle, can do alternate steps, cannot hop) places the child at approximately **3.5 years** *Incorrect: 4.5 years and 5.5 years* - By 4.5-5.5 years, children should have already achieved the ability to **hop on one foot** (typically by 4 years) - These ages are too advanced for a child who cannot yet hop *Incorrect: 2.5 years* - At 2.5 years, most children walk up stairs with **both feet on each step** rather than using alternate steps - **Reciprocal stair climbing** (alternate steps) typically develops around **3-3.5 years** - This age is too young for the described skill set

Practice by Chapter

Normal Growth Parameters

Practice Questions

Developmental Milestones

Practice Questions

Puberty and Adolescent Development

Practice Questions

Growth Disorders

Practice Questions

Failure to Thrive

Practice Questions

Developmental Screening and Assessment

Practice Questions

Developmental Delays

Practice Questions

Growth Charts and Monitoring

Practice Questions

Short Stature

Practice Questions

Tall Stature

Practice Questions

Precocious and Delayed Puberty

Practice Questions

Psychosocial Development

Practice Questions

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