26 Jun When pure breeding black labs with genotype BBEE are crossed
Question
1. Epistasis. In Labrador retrievers coat color is controlled by two loci each with two alleles: B,b and E,e respectively. When pure breeding black labs with genotype BBEE are crossed with pure breeding yellow labs of genotype bbee the resulting F1 offspring all have black coat. When a test cross is done with the F1 using a double homozygous recessive individual the following phenotypic ratios are typically seen.1 Black: 1 Chocolate: 2 Yellowa. Why is the chocolate color present? How can these results be explained? (Hint: one of these genes is epistatic)b. What phenotypic ratios would you then expect from a heterozygous cross (BbEe x BbEe)?
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