Embryology, developmental milestones, and the physiology of pregnancy and the newborn. This category has 38 original questions in the full StepExamPrep bank — here are 3 samples with complete explanations.
Which of the following is typically the first physical sign of puberty in girls?
Breast budding (thelarche) is typically the first physical sign of puberty in girls, usually preceding pubic hair development and the growth spurt.
Researchers compare concordance rates for a disease between monozygotic and dizygotic twins to estimate the relative contribution of genetics versus environment. Which of the following findings would suggest a strong genetic component?
Since monozygotic twins share (nearly) 100% of their genes while dizygotic twins share on average 50%, a significantly HIGHER concordance rate in monozygotic twins suggests a stronger genetic contribution to the disease.
A 4-year-old insists on choosing his own clothes and becomes upset when his parents intervene, showing a strong desire to initiate activities on his own. According to Erikson, which developmental stage is this?
Initiative vs. guilt is the preschool stage (ages ~3-6), characterized by a desire to initiate activities and assert control, matching this child's behavior.
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