Genetics Review

Front

What is the genotype for an individual with a purple phenotype if green is dominant?

Back

gg

Front

What is the probability of a blue-eyed baby from two brown-eyed parents (Bb)?

Back

25%

Front

What does the genotype 'aa' represent in terms of dominance?

Back

Recessive

Front

What does it mean if a trait is homozygous?

Back

The letters are the same.

Front

What is a trait that always shows up called?

Back

Dominant

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 only expresses its trait when two copies are present.

Front

What is the difference between homozygous and heterozygous genotypes?

Back

Homozygous has identical alleles; heterozygous has different alleles.

Front

What is the expected phenotypic ratio of a monohybrid cross?

Back

3:1 for dominant to recessive traits.

Front

What is a Punnett square used for?

Back

To predict the genotypes and phenotypes of offspring from genetic crosses.