Assume that there is complete dominance and complete penetra

Assume that there is complete dominance and complete penetrance at each locus and that epistasis does not occur. Write your answers in numeric form.

Referring to the cross DdFFGghhRrTt x DDffGgHhRRTt:

1. How many different gametes does the DdFFGghhRrTt parent produce? ___________

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

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

4. 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.) ________

5. 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.) __________

6. 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). __________

Solution

1. possible number of gametes for DdFFGghhRrTt =

                  2ⁿ                     ( Where n = 6 )   

               2 ⁴      = 16

2. Number of genotypes of cross is 72

3. Number of different phenotypes : 8

4. The probability that the first offspring from this cross will show the dominant phenotype for all loci : 0.28125

5. The probability that the first offspring from this cross will be heterozygous for all loci : 0.06250

6. The probability that the first offspring from this cross will be son with genotype DDFfGghhRrTt : 4