There are nine coat colors known in foxes. If a red fox were crossed with a double-black fox, all the
hybrids would be red above and black below in a pattern known as blended cross. If two blended
crosses were mated, the F2 ratio would be as follows: 1 red, 2 smoky 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 a sub-Alaskan silver
Observing Patterns in Inherited Traits 119
and a cross red What will be an ideal response?
(a) 1 AA BB red
2 AA Bb smoky red
2 Aa BB cross red
4 Aa Bb blended cross
1 aa BB standard silver
2 aa Bb substandard silver
1 AA bb Alaskan silver
2 Aa bb sub-Alaskan silver
1 aa bb double black
(b) aa BB standard silver ? AA bb Alaskan silver
(c) AA BB red, AA bb Alaskan silver, aa BB standard silver, aa bb double black
(d) 1 standard silver aa BB
2 substandard silver aa Bb, 1 double black aa bb
(e) 1 smokey red AA Bb, 2 blended cross Aa Bb, 1 substandard silver aa Bb
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