Punnett Square Practice

Front

What is a Punnett Square?

Back

A Punnett Square is a diagram used to predict the outcome of a genetic cross by showing the possible combinations of alleles from the parents.

Front

What does the term 'allele' mean?

Back

An allele is a variant form of a gene that can produce different traits.

Front

What is the difference between dominant and recessive alleles?

Back

Dominant alleles mask the effect of recessive alleles in a heterozygous genotype.

Front

If a plant has the genotype 'AA', what is its phenotype?

Back

The phenotype is the observable trait, which in this case would be the dominant trait associated with 'A'.

Front

What is the genotype for a plant that shows a recessive trait?

Back

The genotype must be homozygous recessive, represented as 'aa'.

Front

In a cross between 'AA' and 'aa', what are the possible genotypes of the offspring?

Back

All offspring will have the genotype 'Aa'.

Front

What is the expected phenotypic ratio of a monohybrid cross?

Back

The expected phenotypic ratio is typically 3:1 for dominant to recessive traits.

Front

What does it mean if a trait is 'homozygous'?

Back

Homozygous means having two identical alleles for a particular gene, such as 'AA' or 'aa'.

Front

What does it mean if a trait is 'heterozygous'?

Back

Heterozygous means having two different alleles for a particular gene, such as 'Aa'.

Front

What is the probability of obtaining a homozygous recessive offspring from a cross of 'Aa' x 'Aa'?

Back

The probability is 25%.