Question

question 6

when do sex organs begin to differentiate during prenatal development?

between 4-8 weeks
between 9-12 weeks
between 20-24 weeks
between 1-2 weeks

Explanation:

Identify the developmental timeline

During Prenatal Development Stages, the embryonic period spans from week 3 through week 8 post-conception. This is a critical window of organogenesis where all major organ systems, including the foundations of the reproductive system, begin to form and differentiate.

Pinpoint sexual differentiation

The bipotential gonads and early reproductive structures begin their initial differentiation process into male or female sex organs during the second half of the embryonic period, specifically starting around week 6 to week 8. Therefore, the initiation of sex organ differentiation falls within the 4-8 weeks range.

Evaluate the options

• Between 4-8 weeks: Correct, as the genetic signals (such as the SRY gene on the Y chromosome) initiate the differentiation of the indifferent gonads into testes or ovaries during this embryonic window.
• Between 9-12 weeks: Incorrect; while external genitalia become more clearly distinguishable during the early fetal period (weeks 9-12), the differentiation process itself begins earlier in the embryonic stage.
• Between 20-24 weeks: Incorrect; this is much too late in development.
• Between 1-2 weeks: Incorrect; this is the germinal stage, prior to organogenesis.

Answer:

• Between 4-8 weeks (Correct answer)
• Between 9-12 weeks
• Between 20-24 weeks
• Between 1-2 weeks