Genetics

Front

What does genotype refer to?

Back

The possible combination of alleles in a gene.

Front

If you cross a horse with WW and a horse with ww, what fraction of the offspring would be expected to have white hair?

Back

All offspring will have white hair.

Front

Which of the following is homozygous recessive? BB, Bb, or bb?

Back

bb

Front

Which of the following is heterozygous? BB, Bb, or bb?

Back

Bb

Front

Two brown-eyed parents (Bb) have a baby. What is the chance the baby is blue-eyed?

Back

25%.

Front

What is the definition of a dominant allele?

Back

An allele that expresses its trait even in the presence of a recessive allele.

Front

What is the definition of a recessive allele?

Back

An allele that expresses its trait only when two copies are present.

Front

What is the phenotypic ratio of a monohybrid cross between two heterozygous parents?

Back

3:1.

Front

What is the difference between homozygous and heterozygous?

Back

Homozygous means having two identical alleles for a trait; heterozygous means having two different alleles.

Front

What is a Punnett square used for?

Back

To predict the genotypes and phenotypes of offspring from a genetic cross.