Sex-linked Inheritance

Hemophilia is an X-linked recessive disorder (Xh) that is passed through generations and can be traced by using a pedigree. mc018-1.jpg What is the probability that a female child of Charles and Marie would suffer from hemophilia?

0 percent

Duchenne muscular dystrophy is an X-linked recessive disorder. mc009-1.jpg What is the probability that a female offspring of the cross that is shown above would have a recessive allele for Duchenne muscular dystrophy disorder?

100 percent

Hemophilia is an X-linked recessive disorder. mc005-1.jpg What is the probability of having hemophilia for the cross that is shown in the Punnett square?

50 percent

Which statement about inheritance is true?

Fathers always determine the gender of the offspring in humans.

Which of Thomas Hunt Morgan's hypotheses was valid?

White eyes are homozygous recessive in female Drosophila.

Which allele combination represents a female who has a heterozygous sex-linked trait?

XRXr

What is genotype for a recessive trait found on the female chromosome?

Xh

1 2 3 4 5 6 7 8 9 10 Drosophila eye color is an X-linked trait. Red eye color is dominant, and white eye color is recessive. Which Punnett square shows the probability that 25 percent of offspring will be red-eyed males?

mc006-2.jpg

Which is not considered a sex-linked trait?

purple flower color in pea plants

What is the purpose of using a pedigree?

to understand patterns of inheritance in organisms