Answers Lincoln Biology A-CRSex-linked Inheritance

Sex-linked Inheritance Answers

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Which statement about inheritance is true?

Girls get most of their traits from their moms; boys get most of their traits from their dads.

Male offspring will always have an X-linked genetic disease if the mom is a carrier.

Fathers always determine the gender of the offspring in humans.

Males never have Y chromosomes.

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What is the purpose of using a pedigree?

to study the causes of traits that are acquired during an organism’s life

to understand patterns of inheritance in organisms

to determine mating patterns in organisms

to identify traits that are acquired during an organism’s life

Duchenne muscular dystrophy is an X-linked recessive disorder. 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?

0 percent

25 percent

50 percent

100 percent

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

0 percent

25 percent

50 percent

75 percent

Which is not considered a sex-linked trait?

purple flower color in pea plants

eye color in fruit flies

red-green color blindness in humans

hemophilia in humans

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

Which statement is always true when describing sex-linked inheritance?

It results in a dominant trait.

The alleles are found on the X or Y chromosome.

The resulting trait is influenced by multiple alleles.

It is affected by alleles on at least three different chromosomes.

What was Thomas Hunt Morgan's main contribution to science?

He discovered that certain traits were linked to the X chromosome.

He was the first to use fruit flies in research.

He created the first white-eyed female Drosophila.

He created the first white-eyed male Drosophila.

Hemophilia is an X-linked recessive disorder (Xh) that is passed through generations and can be traced by using a pedigree. Based on the pedigree that is shown, which describes John?

carrier for hemophilia

expresses hemophilia

does not have hemophilia

expresses hemophilia and died of complications

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

XRY

XrY

XRXr

XRXR

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Sex-linked Inheritance Answers

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