Sex-linked Inheritance

Question 1

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Revolt · Accepted Answer

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.

Question 2

Which pedigree symbol is used to represent a female carrier of a recessive X-linked trait?

Revolt · Accepted Answer

A half-filled circle.

Question 3

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?

Revolt · Accepted Answer

100 percent

Question 4

Error

Revolt · Accepted Answer

Xh

Question 5

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

Revolt · Accepted Answer

XRXr

Question 6

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

Revolt · Accepted Answer

A filled square.

Question 7

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

Revolt · Accepted Answer

The alleles are found on the X or Y chromosome.

Question 8

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

Revolt · Accepted Answer

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

Question 9

How are the alleles for sex-linked traits inherited?

Revolt · Accepted Answer

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

Question 10

Error

Revolt · Accepted Answer

alleles that are carried on X and Y chromosomes

Sex-linked Inheritance Answers

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