# 1. A dimpled woman wants to have children and finds a suitable donor at her local...

###### Question:

1. A dimpled woman wants to have children and finds a suitable donor at her local sperm bank. Her genotype is Dd, and her chosen sperm donor’s genotype is dd. Her plan is to produce 3 children, and she is curious to know the probability that she will have at least two children with dimples. That probability is:

2. A dimpled woman wants to have children and finds a suitable donor at her local sperm bank. Her genotype is Dd, and her chosen sperm donor’s genotype is dd. Her plan is to produce 3 children, and she is curious to know the probability that she will have at least two children with dimples, given that her first child has dimples. That probability is:

3.

Here is the information necessry to solve this problem:

• Duchenne Muscular Dystrophy (DMD) is an X-linked recessive trait

• Having dimples is an autosomal dominant trait

• Having attached earlobes is an autosomal recessive trait

• The pertinent genes are not linked

A father with DMD, dimples, and unattached earlobes meets a healthy woman with dimples, and attached earlobes. They fall in love, and wish to have children together. They seek the assistance of a genetic counselor, and the genetic counselor orders genotyping services for the couple. The analysis indicates that the prospective parents have the following genotypes:

XdY·Dd·Ee and XDXd·Dd·ee

What is the chance that their first child would be a daughter that has DMD, no dimples, and attached earlobes?

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