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Modern Genetic Analysis Answers to Selected Problems
Chapter 17*

1. | Selection, mutation, migration, inbreeding, and random genetic drift See question

2. | A1 = 0.57, A2 = 0.43 See question

4. | 0.65 See question

6.

a. p = 0.5249, q = 0.4751

If the population is in equilibrium, the phenotypes should be distributed as follows:

The population is in equilibrium.

b. If mating is random with respect to blood type, then the following frequency of matings should occur:

The mating is random with respect to blood type.

See question

7. | a and b. c. 0.102 d. p = 0.56, q = 0.44 See question

9. | The frequency of a phenotype in a population is a function of the frequency of alleles that lead to that phenotype in the population. To determine dominance and recessiveness, do standard Mendelian crosses. See question

11.

Dominance is usually wild type because most detectable mutations in enzymes result in lowered or eliminated enzyme function. To be dominant, the heterozygote has approximately the same phenotype as the homozygous dominant. This will be true only when the wild-type allele produces a product and the mutant allele does not.

The chromosomal rearrangements are dominant mutations because so many genes are affected that it is highly unlikely that all of their alleles will be dominant and "cover" for them.

See question

14. | Albinos may have been considered lucky and encouraged to breed at very high levels in comparison with nonalbinos. They may also have been encouraged to mate with each other. Alternatively, in the tribes with a very low frequency, albinos may have been considered very unlucky and destroyed at birth or prevented from marrying. See question

17. | (a). 0.528; (b). 0.75. See question

18. | 0.01 See question

20. | 6.5 See question

© 1999 by W. H. Freeman and Company. All rights reserved.