Question

There are five common features characterizing X-linked recessive inheritance, such as red-green color blindness. Which of the following statements about inheritance patterns of X-linked recessive traits in humans is FALSE?
a. Often, the transmission of the recessive allele from grandfather to daughter to grandson gives the appearance of generation skipping
b. Matings of recessive males (cY) and carrier females (Cc) can not produce the recessive phenotype in females.
c. If a recessive male (cY) mates with a homozygous dominant female (CC), all progeny have the dominant phenotype. All female offspring are heterozygous carriers (Cc), and all male offspring are hemizygous for the dominant allele (CY).
d. As a result of male hemizygosity, more males than females have the recessive phenotype

Answer 1

Answer:

b. Matings of recessive males (cY) and carrier females (Cc) can not produce the recessive phenotype in females

Explanation:

Recessive (hemizygous) males have the genotype $X^c Y$. If they mate carrier (heterozygous) females with the genotype $X^C X^c$, they will produce the following offspring:

• $X^C X^c$
• $X^c X^c$
• $X^C Y$
• $X^c Y$

Half of their female daughters will show the recessive phenotype.