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 homozygous mean?

Back

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

Front

What does heterozygous mean?

Back

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

Front

What is the probability of a child having blue eyes if both parents are homozygous dominant for brown eyes?

Back

0% - Both parents can only pass on the dominant brown eye allele.

Front

If yellow flowers (Y) are dominant to white flowers (y), what is the phenotype of a plant with genotype 'Yy'?

Back

The phenotype is yellow flowers.

Front

What is the genotype of a plant that has white flowers if white is recessive?

Back

The genotype must be 'yy'.

Front

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

Back

The letters represent the alleles contributed by each parent.

Front

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

Back

The expected phenotypic ratio is 3:1.

Front

What does it mean if a trait is dominant?

Back

A dominant trait is one that will be expressed in the phenotype even if only one dominant allele is present.

Front

What does it mean if a trait is recessive?

Back

A recessive trait is one that will only be expressed in the phenotype if two recessive alleles are present.