Punnett Square Practice

Front

What is a genotype?

Back

A genotype is the genetic makeup of an organism, represented by the alleles it possesses (e.g., BB, Bb, bb).

Front

What does a Punnett Square illustrate?

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 is the difference between dominant and recessive alleles?

Back

Dominant alleles are expressed in the phenotype even if only one copy is present (e.g., P), while recessive alleles are only expressed if two copies are present (e.g., pp).

Front

If a plant has the genotype Bb, what are the possible phenotypes?

Back

The possible phenotypes are purple (dominant) and white (recessive), with purple being expressed.

Front

What is the probability of an offspring being homozygous recessive (bb) if both parents are heterozygous (Bb)?

Back

The probability is 25%.

Front

What does heterozygous mean?

Back

Heterozygous refers to having two different alleles for a particular gene (e.g., Bb).

Front

What does homozygous mean?

Back

Homozygous refers to having two identical alleles for a particular gene (e.g., BB or bb).

Front

What are the possible genotypes of offspring from a cross between AA and aa?

Back

The possible genotypes are Aa only.

Front

What is the phenotype of an organism with the genotype AA?

Back

The phenotype is brown hair, as A is dominant.

Front

Which of the following is NOT a genotype: heterozygous, a trait, Bb, homozygous recessive?

Back

A trait is NOT a genotype.