Punnet Squares 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 it mean for an allele to be dominant?

Back

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

Front

What does it mean for an allele to be recessive?

Back

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

Front

What is the genotype of a heterozygous individual?

Back

A heterozygous individual has two different alleles for a particular gene, represented as 'Aa'.

Front

What is the genotype of a homozygous dominant individual?

Back

A homozygous dominant individual has two identical dominant alleles for a particular gene, represented as 'AA'.

Front

What is the genotype of a homozygous recessive individual?

Back

A homozygous recessive individual has two identical recessive alleles for a particular gene, represented as 'aa'.

Front

If two heterozygous parents (Aa) have a child, what is the probability that the child will be homozygous recessive (aa)?

Back

25%.

Front

If a heterozygous male (Aa) marries a recessive female (aa), what is the probability that their child will be heterozygous (Aa)?

Back

50%.

Front

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

Back

Phenotype refers to the observable traits or characteristics of an individual, such as eye color or hair type.

Front

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

Back

Genotype refers to the genetic makeup of an individual, specifically the alleles present for a particular gene.