Question

A cross is made between heterozygous black and homozygous brown mice. Give the genotype and phenotype of offspring that black colour is dominant over brown colour.

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Answer 1

Answer:

When true-breeding, or homozygous, individuals that differ for a certain trait are crossed, all of the offspring will be heterozygous for that trait. If the traits are inherited as dominant and recessive, the F1 offspring will all exhibit the same phenotype as the parent homozygous for the dominant trait.