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 allele combinations 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 homozygous and heterozygous genotypes?

Back

Homozygous genotypes have two identical alleles (e.g., AA or aa), while heterozygous genotypes have two different alleles (e.g., Aa).

Front

What does 'dominant' mean in genetics?

Back

A dominant allele is one that expresses its trait even when only one copy is present in the genotype.

Front

What does 'recessive' mean in genetics?

Back

A recessive allele is one that only expresses its trait when two copies are present in the genotype.

Front

If G = green and g = yellow, what color will a plant with genotype Gg be?

Back

The plant will be green because the dominant allele G masks the effect of the recessive allele g.

Front

What is the probability of producing a homozygous recessive offspring from a cross of two heterozygous parents (Aa x Aa)?

Back

The probability is 25%.

Front

What is a genotype?

Back

A genotype is the genetic makeup of an organism, represented by the alleles it possesses.

Front

What is a phenotype?

Back

A phenotype is the observable physical or biochemical characteristics of an organism, determined by its genotype.

Front

In a Punnett Square, what do the letters on the top and side represent?

Back

The letters on the top represent the alleles from one parent, and the letters on the side represent the alleles from the other parent.