Punnett Squares Basics

Front

What is a Punnett square?

Back

A diagram used to predict the possible genotypes of offspring based on their parents' genotypes.

Front

What phenotype do AA and Aa always show?

Back

Dominant phenotype.

Front

What does genotype refer to?

Back

The combination of alleles in an organism.

Front

If two brown-eyed parents (Bb) have a baby, what is the chance the baby is blue-eyed?

Back

25%.

Front

Which of the following alleles is homozygous (purebred) recessive?

Back

tt.

Front

What is the difference between homozygous and heterozygous genotypes?

Back

Homozygous genotypes have two identical alleles, while heterozygous genotypes have two different alleles.

Front

What does the term 'allele' mean?

Back

An allele is a variant form of a gene.

Front

What is the purpose of a Punnett square in genetics?

Back

To visualize and calculate the probability of offspring inheriting particular traits.

Front

What is the expected genotype ratio from a monohybrid cross between two heterozygous parents (Aa x Aa)?

Back

1 AA : 2 Aa : 1 aa.

Front

What is the expected phenotype ratio from a monohybrid cross between two heterozygous parents (Aa x Aa)?

Back

3 dominant : 1 recessive.