[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.

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