Question

a man possesses an allele for a recessive x - linked genetic condition, and his wife does not possess the allele. what are the odds that the couples son will express the condition? 0% 25% 50% 100%

Explanation:

Step1: Understand X - linked inheritance

In X - linked inheritance, males have one X and one Y chromosome (XY), and females have two X chromosomes (XX). A male passes his Y chromosome to his sons and his X chromosome to his daughters.

Step2: Analyze the parents' chromosomes

The man has the allele for the recessive X - linked condition on his X chromosome. His wife does not have the allele. Sons inherit their X chromosome from their mother and Y chromosome from their father.

Step3: Determine the son's genotype

Since the son gets his X chromosome from his mother (who does not have the allele for the recessive X - linked condition) and his Y chromosome from his father, the son will not have the recessive allele on his X chromosome. So the probability of the son expressing the recessive X - linked condition is 0.

Answer:

0%