HELIXPrep › Genetics, Cellular and Molecular Biology › Genetics & Evolutionary Biology
Module 3.1 · Topic 2
Module 3.1 · Topic 2
How two black Labradors have a yellow puppy
Two black Labrador Retrievers, both with two working copies of the black-pigment gene, have a litter — and one puppy is bright yellow. Black should be dominant. If both parents can make black pigment, where did yellow come from?
Cross two heterozygous parents (Bb × Bb) for a single gene. What phenotype ratio do you expect among the offspring?
Crossing two heterozygous individuals (Bb × Bb) for a single gene with complete dominance produces offspring in a phenotype ratio of:
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