Sex-linked Inheritance

Question 1

Why are women often carriers of X-linked traits but rarely affected by them?

Revolt · Accepted Answer

Women have two X chromosomes, so a recessive allele on one X chromosome is often masked by a dominant allele on the other X chromosome. Women are usually affected only if they inherit two recessive alleles.

Question 2

The pedigree on the right shows the inheritance pattern for an X-linked recessive disorder.How many individuals are carriers of the disease but are not affected?

Revolt · Accepted Answer

4

Question 3

What is the genotype of the male circled in pink?

Revolt · Accepted Answer

XaY

Question 4

The pedigree on the right shows the inheritance pattern for an X-linked recessive disorder.The mother of the individuals circled in pink is not shown on the pedigree. Based on the phenotypes of these individuals and their father, what are the possible genotypes of their mother? Check all of the boxes that apply.

Revolt · Accepted Answer

XAXA; XAXa

Question 5

The pedigree on the right shows the inheritance pattern for an X-linked recessive disorder.If the female circled in pink married an affected male and had a female child, what is the chance that the child would also be affected? Express your answer in a percentage.%What is the chance that the child would be a carrier?%

Revolt · Accepted Answer

Part 1: 50

Question 6

True or false? The child could be standard.

Revolt · Accepted Answer

false

Sex-linked Inheritance Answers

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