[Campbell Biology P.1084] Based on the "WHAT IF?" scenario, if a fetus has a genetic disorder... | Practice Question

Based on the "WHAT IF?" scenario, if a fetus has a genetic disorder leading to increased testosterone production, why might the mother develop a male-like pattern of body hair during pregnancy?

  • A: The mother's own adrenal glands increase testosterone production in response to the fetal disorder.
  • B: The fetal testosterone directly stimulates the mother's hair follicles, as testosterone can cross the placenta.
  • C: The fetal testosterone interferes with the mother's estrogen production, leading to a relative increase in male hormones.
  • D: The mother's body produces testosterone to compensate for the enzyme deficiency in the fetus.

Explanation

Steroid hormones like testosterone can cross the placenta. If the fetus is producing abnormally high levels of testosterone due to a genetic disorder, this excess can enter the maternal circulation. Testosterone is an androgen, and high levels in a female can lead to masculinizing effects, such as increased body hair, due to its direct action on hair follicles.