Sex-linked Inheritance Answers

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

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

How are the alleles for sex-linked traits inherited?

They are passed from the Y chromosome in parents to the X chromosome in offspring.

They are passed from the X chromosome in parents to the XY chromosome in offspring.

They are passed from parents to offspring on the X and Y chromosomes.

They are passed from any chromosome in the parents to the X or Y chromosome in the offspring.

Which allele combination represents a female who is a carrier for an X-linked recessive disorder?

XRXr

XrXr

XRY

XrY

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

0 percent

25 percent

50 percent

100 percent

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.

Drosophila eye color is an X-linked trait. Red eye color is dominant, and white eye color is recessive. Which Punnett square shows a cross in which the probability of offspring will have red eyes is 100 percent?

A Punnett square is shown. The columns are labeled Upper X r and Upper Y. The rows are labeled x Upper R and x Upper R. Clockwise, from top-left, the boxes include: Upper X Upper R Upper X r, Upper X Upper R Y, X Upper R Upper Y, X Upper R Upper X r.

A Punnett square is shown. The columns are labeled Upper X Upper R and Upper Y. The rows are labeled x Upper R and x r. Clockwise, from top-left, the boxes include: Upper X Upper R Upper X Upper R, Upper X Upper R Upper Y, Upper X r Upper Y, Upper X uppercase Upper R Upper X r.

A Punnett square is shown. The columns are labeled Upper X r and Upper Y. The rows are labeled x r and x r. Clockwise, from top-left, the boxes include: Upper X r Upper X r, Upper X r Upper Y, Upper X r Upper Y, Upper X r Upper X r.

A Punnett square is shown. The columns are labeled Upper X r and Upper Y. The rows are labeled x Upper R and x r. Clockwise, from top-left, the boxes include: Upper X Upper R Upper X r, Upper X Upper R Y, Upper X r Upper Y, Upper X r Upper X r.

Which symbol is used to label a male that expresses a sex-linked disorder on a pedigree?

An empty circle.

A half-filled circle.

An empty square.

A filled square.

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.

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

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Sex-linked Inheritance Answers

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