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Fat color is determined by a single gene in sheep, and white fat is dominant to yellow fat.
At a second gene, normal ears are incompletely dominant to earless, and heterozygotes are short-eared. This flock is also segregating for all three ear types. The coat of the house mouse can be various colors. Matings were made between black, tan and yellow mice, and the following ratios were observed. Cross Parents Phenotypic ratio 1.