Genetics: From Genes to Genomes
6th Edition
ISBN: 9781259700903
Author: Leland Hartwell Dr., Michael L. Goldberg Professor Dr., Janice Fischer, Leroy Hood Dr.
Publisher: McGraw-Hill Education
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Chapter 2, Problem 47P
The following pedigree shows the inheritance of red hair in a family in Scotland. Red hair is caused by homozygosity for a recessive allele of a gene called MC1R. Although worldwide red hair is the rarest of human hair colors, red hair is not uncommon in Scotland. In fact, 40% of Scots without red hair are nonetheless carriers of the red hair allele.
| a. | Why does red hair show a horizontal inheritance pattern in this particular pedigree even though the trait is caused by a recessive allele? |
| b. | Assuming that individual III-2 has a child with the Scottish woman shown (III-1) who is not a close relative, what is the probability that this child (IV-1) will have red hair? |
| c. | What is the probability that the child of first cousins III-9 and III-10 (IV-2) will have red hair? |
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Chapter 2 Solutions
Genetics: From Genes to Genomes
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