Males can be heterozygous for sex-linked traits.

What would the genotype be of a colorblind male?

How many recessive genes does a carrier female have for colorblindness?

Colorblindness is a sex-linked recessive trait. A colorblind woman marries a male with normal color vision. What is the percent chance of them having a color blind son?

Muscular dystrophy is a sex-linked recessive disorder. A man with muscular dystrophy marries a woman who doesn’t have this disease. Half of their daughters and half of their sons develop this disease. What is the genotype of the mother?

A X-linked gene in fruit flies controls the patterns of the wings. X^B has a barred pattern and X^b doesn’t have bars. A male with barred wings is mated to a non-barred female. What would be the genotype(s) of their female offspring?

A boy whose parents have normal vision is colorblind. What are the genotypes for his mother and father? Use X^N for normal vision and Xⁿ for colorblindness. Show the Punnett square to support your answer.

The bison herd on Konza Prairie has a sex-linked trait known as “rabbit hock” in which the knee of the back leg is slightly malformed. A male bull that is normal mates with a cow that is a carrier for rabbit hock. What are his chances of producing a normal male?

The bison herd on Konza Prairie has a sex-linked trait known as “rabbit hock” in which the knee of the back leg is slightly malformed. A male bull that is normal mates with a cow that is a carrier for rabbit hock. Of the female offspring, what percent would be carriers?

A woman who is colorblind has a mother with normal vision. Knowing that colorblindness is a sex-linked recessive gene, what is her mother’s genotype? What is her father’s genotype? Use X^N for normal vision and Xⁿ for colorblindness.

The woman who is colorblind marries a man with normal vision. What is the probability that their sons will be colorblind?

Challenge! In humans, colorblindness is recessive and sex-linked. In humans, brown hair is dominant to blond. A woman who is heterozygous for brown hair and a carrier for colorblindness marries a man who has blond hair and normal vision. What is the likelihood of having children who are colorblind with blond hair?