You either do not have a Javascript capable browser, or have Javascript turned off. Please either upgrade to Netscape 4, Internet Explorer 4 or higher, or turn Javascript back on if you already have one of these.

Introductory Animal Genetics
Animal Science 221

Multiple Alleles

In dogs, there are several alleles known at a color locus referred to as the agouti locus. Three of these alleles are:

As       Dominant black
aw       Agouti
at       Bicolor (tan points)

The order listed indicates the order of dominance, such that: As > aw > at

What is the ratio of progeny phenotypes from the following matings:

Choose a mating:

Asat x awaw

Asat x ataw

awat x awat      

     

  Black

  Agouti

  Bicolor


A female is black and her pups are bicolored and black:

a.

Which one of the following genotypes is hers :

 AA
Aaw
Aat

b.

Which is the only
genotype of the sire that is precluded:

 Aat
awat
atat
awaw


Return to: Animal Science 221

Home page: Animal Science at Cornell University


For problems or comments on this web page, contact the Animal Science Webmaster