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 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. |
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Coat of Arms of Sauerlach, Germany
Juglans nigra (Black Walnut tree) lower leaf surface
Contrasting Colors (Part 2)
Ripening black cherries (Prunus serotina) release ethylene that stimulates abscission of the fruits