Genetic Analysis: An Integrated Approach (2nd Edition)
Genetic Analysis: An Integrated Approach (2nd Edition)
2nd Edition
ISBN: 9780321948908
Author: Mark F. Sanders, John L. Bowman
Publisher: PEARSON
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Chapter 3, Problem 13P

In humans, hemophilia A (OMIM 306700) is an X-linked recessive disorder that affects the gene for factor VIII protein, which is essential for blood clotting. The dominant and recessive alleles for the factor VIII gene are represented by H and h. Albinism is an autosomal recessive condition that results from mutation of the gene producing tyrosinase, an enzyme in the melanin synthesis pathway. A and a represent the tyrosinase alleles. A healthy woman named Clara (II-2), whose father (I-1) has hemophilia and whose brother (II-1) has albinism, is married to a healthy man named Charles (II-3), whose parents are healthy. Charles’s brother (II-5) has hemophilia, and his sister (II-4) has albinism. The pedigree is shown below.

Chapter 3, Problem 13P, In humans, hemophilia A (OMIM 306700) is an X-linked recessive disorder that affects the gene for

a. What are the genotypes of the four parents (I-1 to I-4) in this pedigree?

b. Determine the probability that the first child of Clara and Charles will be a

i. boy with hemophilia

ii. girl with albinism

iii. healthy girl

iv. boy with both albinism and hemophilia

v. boy with albinism

vi. girl with hemophilia

c. If Clara and Charles’s first child has albinism, what is the chance the second child has albinism? Explain why this probability is higher than the probability you calculated in part (b).

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In humans, hemophilia is an X-linked recessive disorder that affects the gene for factor VIII protein, which is essential for blood clotting. The dominant and recessive alleles for the factor VIII gene are represented by H and h. Albinism is an autosomal recessive condition involving the tyrosinase enzyme which synthesizes pigment. Alleles of tyrosinase are represented by A and a. The provided pedigree shows a new marriage between Clara and Charles.  A) Review the pedigree, filling in any genotypes that can be determined from the displayed traits. B) What is the probability that their first child will display hemophilia, albinism, or BOTH hemophilia AND albinism.C) If Clara and Charles first child has albinism, what is the probability that the second child will also display albinism?
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Genetic Analysis: An Integrated Approach (2nd Edition)

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