Punnett Square Practice Questions

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 if a trait is dominant?

Back

A dominant trait is one that will appear in the offspring if at least one parent contributes the dominant allele.

Front

What is the probability of an offspring having a dominant trait if both parents are heterozygous (Bb)?

Back

75%.

Front

If purple (P) is dominant to white (p), what is the probability of an offspring being purple from a cross of two heterozygous parents (Pp x Pp)?

Back

75%.

Front

What is codominance in genetics?

Back

Codominance is a form of inheritance where both alleles in a heterozygote are fully expressed, resulting in a phenotype that is neither dominant nor recessive.

Front

What is the chance of a blue-eyed child from two brown-eyed parents (Bb)?

Back

25%.

Front

If brown eyes (B) are dominant over blue eyes (b), what is the genotype of a homozygous dominant brown-eyed parent?

Back

BB.

Front

What is the expected phenotype ratio from a monohybrid cross?

Back

1:2:1 genotype ratio and 3:1 phenotype ratio.

Front

What does homozygous mean?

Back

Homozygous refers to having two identical alleles for a particular gene.

Front

What does heterozygous mean?

Back

Heterozygous refers to having two different alleles for a particular gene.