9 Sep 2018

In this set of questions, you will need to be able to apply inheritance patterns of two different characters/genes. One gene is inherited in a sex-linked pattern, while the other gene is inherited through an autosomal gene.

A sex-linked gene determines a condition called glucose-6-phosphate dehydrogenase deficiency (G6PDHD) and is due to an X-linked recessive allele in humans.

An attached earlobe is dominant to a free earlobe, and is an autosomal gene.

Consider the following family history:

A man with an attached earlobe without G6PDHD marries a woman with G6PDHD with free earlobes.

The man’s father had free earlobes, as did both of the woman’s parents.

Use the family history to make predictions about the couple’s children.

Suppose the couple had a daughter without G6PDHD and attached earlobes. What is the probability that she is heterozygous for both genes genes? [ Select ] ["0", "1", "0.25", "0.5", "0.75"]
What is the probability that any son the couple has will have G6PDHD with free earlobes? [ Select ] ["0", "0.25", "0.5", "0.75", "1"]
What is the probability that any daughter that the couple has will have G6PDHD with attached earlobes? [ Select ] ["0", "0.25", "0.5", "0.75", "1"]
If the couple has a child, what is the probability that it will be a son with attached earlobes?

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Nelly Stracke
Nelly StrackeLv2
11 Sep 2018

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