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Introductory Animal Genetics
Animal Science 221
Genotypic and Phenotypic Ratios
with Autosomal Lethal Genes

Consider the joint inheritance of two traits in dogs, one for color and one for hair and hairless.

For color:

BB or Bbis black
bbis brown

For the hair locus:

HHis lethal
Hhis hairless
hhhas hair

What is the ratio of the progeny phenotypes from the following matings in pups observed at birth:
1.
HhBb x HhBb
 Hairless
Black hair
Brown hair

2.
HhBb x hhbb
 Hairless
Black hair
Brown hair



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