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:

• Option 1: Both parents contribute equally to the genetic traits of their offspring. Girls and boys inherit traits from both mom and dad. So this option is false.
• Option 2: If the mom is a carrier of an X - linked genetic disease (heterozygous, say \(X^AX^a\)), and the dad has a normal \(X\) chromosome (\(X^AY\)), the male offspring have a 50% chance of getting the disease (\(X^aY\)) and a 50% chance of being normal (\(X^AY\)). So this option is false.
• Option 3: In humans, females have \(XX\) chromosomes and males have \(XY\) chromosomes. The mother always donates an \(X\) chromosome. The father donates either an \(X\) (resulting in a female offspring \(XX\)) or a \(Y\) (resulting in a male offspring \(XY\)). So fathers always determine the gender of the offspring. This option is true.
• Option 4: Males have \(XY\) chromosomes. So this option is false.

Answer:

Fathers always determine the gender of the offspring in humans.