Heredity and Punnett Squares

Front

What is a phenotype?

Back

The visible or physical trait resulting from the allele pair.

Front

What is a genotype?

Back

The genetic combination of alleles in the allele pair.

Front

What does homozygous mean?

Back

Having two identical alleles for a particular gene.

Front

What does heterozygous mean?

Back

Having two different alleles for a particular gene.

Front

What is a dominant trait?

Back

A trait or characteristic that will appear in the offspring if one or both of the parents contributes it.

Front

What is a recessive trait?

Back

A trait that will only appear in the offspring if both alleles are recessive.

Front

What is a Punnett square?

Back

A diagram used to predict the outcome of a genetic cross.

Front

If brown hair is dominant (B) and blond hair is recessive (b), what is the genotype of a homozygous dominant brown-haired individual?

Back

BB

Front

If a heterozygous brown-haired individual (Bb) is crossed with a homozygous recessive blond-haired individual (bb), what is the probability of having a brown-haired offspring?

Back

50%.

Front

What is the purpose of a test cross?

Back

To determine the genotype of an individual with a dominant phenotype.