There are nine coat colors known in foxes. If a red fox were crossed with a double-black fox, all the

Question

hybrids would be red above and black below in a pattern known as a blended cross. If two blended
crosses were mated, the F2 ratio would be as follows: 1 red, 2 smokey red, 2 cross red, 4 blended cross,
1 standard silver, 2 substandard silver, 1 Alaskan silver, 2 sub-Alaskan silver, and 1 double-black.
(a) Using the letters A/a and B/b to serve as the genes for these animals, develop a genotype
for each variety listed.
(b) Two crosses will produce all blended-cross offspring. One is used above (red fox ?
double-black); what is the other?
(c) List the genotype and phenotype of all the pure-breeding foxes.
(d) Give the genotypic and phenotypic ratio of a cross between two substandard silvers.
(e) Give the genotype and phenotype of the offspring produced in a cross of 1 sub-Alaskan
silver and a cross red. What will be an ideal response?

Answer 1