Problem Set 3 -Answers

1. Because 1/64 is the ratio expected for the 
homozygous recessive phenotype in the F2 
generation of a trihybrid cross.  

2. No, because an additive allelic series 
involves more than one gene.  The alternative 
alleles at those loci are added together to 
produce the final phenotype.

3. 	2/12 black manx female
	2/12 tortoiseshell manx female
	1/12 black normal female
	1/12 tortoiseshell normal female
	2/12 black manx male
	2/12 orange manx male
	1/12 black normal male
	1/12 orange normal male