[IB Biology SL at GHS: Genetics Reviews]

2. A male black rat marries his high school sweetheart who has white fur. After a honeymoon under the GHS grandstands, they return home and have 50 kids, all of whom have black fur. This means that the allele for black fur is __?__.

A) dominant to the recessive white fur. (The black allele is hiding the white allele the baby rats got from their moom!)

B) recessive to the dominant white fur.

C) codominant to the allele for white fur.

D) is sex-linked. Boy rats always have black fur and females always have white fur.

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Slichter