A woman heterzygous for color blindness (an X-linked recessive allele) marries a man with normal color vision. What is the probability that their first child (male or female) will be color blind?   25%   75%   50%   0%   100%

Earlobes can be attached to the face or non-attached. An attached earlobe is a recessive trait. A female with attached earlobes (Il) has a child with a man with non-attached earlobes. He is heterozygous for this trait. Questions: a. What are the possible genotypes of the egg the woman can produce? b. What are the possible genotypes of the sperm the man can produce? c. What is the genotype ratio for the offspring? d. What is the phenotype ratio for the offspring? e. What is the couple's chance of having a child with attached earlobes?

What would be the expected phenotypes and genotypes of the children when a color blind man marries a normal woman?

Red-green colour blindness is a sex-linked trait. Red-green colour blindness (Xrg) is the inability to distinguish between red and green colours. The Xrg allele is recessive to the normal X-linked allele. A normal woman has a father who has red-green colour blindness. She had a child with a man who does not have red-green colour blindness. What is the probability they will have a son with red-green colour blindness? Select one: a. 0 b. 0.13 c. 0.25 d. 0.50