EBK GENETICS: FROM GENES TO GENOMES
6th Edition
ISBN: 9781260041255
Author: HARTWELL
Publisher: MCGRAW HILL BOOK COMPANY
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Chapter 21, Problem 15P
A gene has two alleles A (frequency = p) and a (frequency = q). If a population is at Hardy-Weinberg equilibrium, develop mathematical expressions in terms of p and q that predict the following mating frequencies:
| a. | Between two AA homozygotes |
| b. | Between two aa homozygotes |
| c. | Between two Aa heterozygotes |
| d. | Between an AA homozygote and an aa homozygote |
| e. | Between an AA homozyote and an Aa heterozygote |
| f. | Between an aa homozygote and an Aa heterozygote |
| Considering your answers to parts (a)–(f): | |
| g. | Do the six possibilities listed account for all possible matings? How would you know whether this is true mathematically? Demonstrate this latter point by setting p equal to an arbitrary number between 0 and 1 such as 0.2. |
| h. | Can you develop a simple, general rule for calculating the mating frequencies between individuals of the same genotype versus the mating frequencies between individuals of different genotypes? |
| i. | If the population is equally divided between males and females, what proportion of all matings will be between an AA male and an AA female? Between an AA male and an Aa female? Between an AA male and an aa female? |
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Question #3:
In the KeyGene paper, the authors state that it would be useful if pollen from an apomict would
transmit apomixis-inducing genes to the female in the cross (assuming the pollen is viable). Assuming
there was just one gene conferring gametophytic obligate apomixis, and that the two parents are
inbreds, what would be the consequences of such a cross if:
a) The apomixis was a dominant trait? Indicate the genotypes and phenotypes (apomict or non-
apomict) of the parents, F1 and F2 generations. Remember to include the expected genotypic
and phenotypic ratios (or percentages) in the F1 and F2 generations, and to position the female
first (left side) in the parental cross.
b) The apomixis was a recessive trait? Indicate the genotypes and phenotypes (apomict or non-
apomict) of the parents, F1 and F2 generations. Remember to include the expected genotypic
and phenotypic ratios (or percentages) in the F1 and F2 generations, and to position the female
first (left side) in the…
Chapter 21 Solutions
EBK GENETICS: FROM GENES TO GENOMES
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