Assume that there is complete dominance and complete penetrance at each locus an
ID: 3519682 • Letter: A
Question
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? ___________
How many different genotypes are found among the progeny of this cross? ____________
How many different phenotypes are found among the progeny of this cross? ____________
Explanation / Answer
Number of different gametes is calculated by using the formula, N = 2n where N= number of gametes and n = number of heterozygous gene pairs. Here number of heterozygous gene pairs is 3 (Dd, Gg,and Rr). Therefore, total number of possible gamtes is 23 = 8
Number of genotype is given by 3n = 33 = 27
Number of phenotypes is given by 2n = 23 = 8