Test Practice Genetics and Heredity

Use this Punnett square to answer the question.

In horses, the gene for white hair (W) is dominant to the gene for non-white hair (w). A horse with genotype (WW) was crossed with a horse with genotype (ww), as shown in the Punnett square.

What fraction of the offspring should be expected to have white hair?

In a certain species of meadow mouse, dark coat color is dominant over cream coat color. If heterozygous dark-coated male mice are mated with cream-coated female mice, what would be the expected percentage of phenotypes in their offspring?

In pea plants, the gene for tallness (T) is dominant over the gene for shortness (t). If 100% of the F1 generation offspring are heterozygous tall, what were the most probable genotypes of the parent plants?

When a mouse with black fur is crossed with a mouse with white fur, all F1 generation offspring have grey fur. Which phenotypic results can be expected in the F2 generation?

Which statement about DNA is correct?