Question

which statement about inheritance is true?
girls get most of their traits from their moms; boys get most of their traits from their dads.
male offspring will always have an x - linked genetic disease if the mom is a carrier.
fathers always determine the gender of the offspring in humans.
males never have y chromosomes.

Explanation:

1. Analyze the first option: Both girls and boys inherit traits from both parents (moms and dads) through a combination of genetic material, so this is false.
2. Analyze the second option: For an X - linked recessive disease, if the mom is a carrier (X^A X^a), the male offspring (X^A Y or X^a Y) has a 50% chance of getting the disease - not always. For X - linked dominant, if the mom is a carrier, the inheritance pattern is different, but still not "always". So this is false.
3. Analyze the third option: In humans, females have XX chromosomes and males have XY. The mother always contributes an X chromosome, and the father can contribute either an X (resulting in a girl, XX) or a Y (resulting in a boy, XY). So the father's contribution of X or Y determines the gender of the offspring. This is true.
4. Analyze the fourth option: Males typically have one X and one Y chromosome (XY), so the statement that males never have Y chromosomes is false.

Answer:

C. Fathers always determine the gender of the offspring in humans.