Practice Punnett Squares

Front

What is a Punnett square?

Back

A Punnett square is a diagram used to predict the genotype and phenotype combinations of a genetic cross.

Front

What does it mean for a trait to be dominant?

Back

A dominant trait is one that is expressed in the phenotype even when only one copy of the allele is present.

Front

What does it mean for a trait to be recessive?

Back

A recessive trait is one that is expressed in the phenotype only when two copies of the allele are present.

Front

What is the genotype of an individual with freckles if freckles are dominant and the individual has one dominant and one recessive allele?

Back

The genotype is Ff.

Front

If a homozygous tall pea plant (TT) is crossed with a homozygous short pea plant (tt), what is the genotype of the offspring?

Back

All offspring will be heterozygous tall (Tt).

Front

What is the probability of obtaining a homozygous genotype from a cross between two heterozygous parents (Tt x Tt)?

Back

The probability is 25%.

Front

In a genetic cross, what does the term 'phenotype' refer to?

Back

Phenotype refers to the observable physical characteristics of an organism.

Front

In a genetic cross, what does the term 'genotype' refer to?

Back

Genotype refers to the genetic makeup of an organism, specifically the alleles it carries.

Front

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

Back

The expected phenotypic ratio is 3:1.

Front

How do you determine the probability of offspring traits using a Punnett square?

Back

By filling in the Punnett square with the alleles from each parent and counting the resulting genotypes.