Heredity and Punnett Squares

Front

What do the genotypes AA and Aa represent in terms of dominance?

Back

Dominant

Front

What is the ratio of homozygous recessive offspring from a cross if the result is 0 in 4?

Back

0 in 4

Front

What does the genotype 'tt' indicate about an organism's alleles?

Back

Homozygous recessive

Front

If B is the dominant allele for brown hair, what is the phenotype for the genotype Bb?

Back

Brown Hair

Front

What are the possible genotypes from a cross that results in TT = 25%, Tt = 50%, and tt = 25%?

Back

TT, Tt, tt

Front

Define homozygous dominant.

Back

An organism with two identical dominant alleles (e.g., AA).

Front

Define homozygous recessive.

Back

An organism with two identical recessive alleles (e.g., tt).

Front

What is a phenotype?

Back

The observable physical or biochemical characteristics of an organism, determined by its genotype.

Front

What is a genotype?

Back

The genetic constitution of an organism, represented by alleles.

Front

What is the purpose of a Punnett square?

Back

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