Question

Assume that there is complete dominance and complete penetrance at each locus and that epistasis does...

Assume that there is complete dominance and complete penetrance at each locus and that epistasis does not occur. (These are the same conditions we used in class). Write your answers in numeric form (not in words).

Referring to the cross DdFfGgHhRrTT x DDffGgHhRRTt:

How many different gametes does the DdFfGgHhRrTT parent produce? Answer

How many different genotypes are found among the progeny of this cross? Answer

How many different phenotypes are found among the progeny of this cross? Answer

What is the probability that the first offspring from this cross will show the dominant phenotype for all loci? (Type in as a decimal and round to 6 digits.) Answer

What is the probability that the first offspring from this cross will be heterozygous for all loci? (Type in as a decimal and round to 6 decimal digits.) Answer

What is the probability that the first offspring from this cross will be a son with genotype DDFfGghhRrTt? (Type in as a decimal and round to 6 decimal digits).

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Homework Answers

Answer #1

1. How many different gametes does the DdFfGgHhRrTT parent produce?

answer is 32

number of gametes produced is 2n , where n is the number heterozygous alleles.

2. How many different genotypes are found among the progeny of this cross?

answer is 144

3. How many different phenotypes are found among the progeny of this cross?

answer is 8

4. What is the probability that the first offspring from this cross will show the dominant phenotype for all loci?

answer is 0.222222

5. What is the probability that the first offspring from this cross will be heterozygous for all loci?

answer is 0.006944

6. What is the probability that the first offspring from this cross will be a son with genotype DDFfGghhRrTt?

answer is 0.006944

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