Basic Punnett Square Review

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 an allele is 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 if an allele is recessive?

Back

A recessive allele is one that is masked by a dominant allele and only expresses its trait when two copies are present.

Front

What is the genotype for a homozygous organism?

Back

A homozygous organism has two identical alleles for a particular trait (e.g., AA or aa).

Front

What is the genotype for a heterozygous organism?

Back

A heterozygous organism has two different alleles for a particular trait (e.g., Aa).

Front

What is the probability of an offspring being purple if both parents are homozygous purple (PP)?

Back

100% probability of being purple.

Front

What is the probability of an offspring being purple if one parent is homozygous purple (PP) and the other is homozygous white (pp)?

Back

100% probability of being purple.

Front

In a cross between two heterozygous plants (Pp x Pp), what is the probability of getting a white offspring?

Back

25% probability of getting a white offspring.

Front

Where are chromosomes located in a cell?

Back

Chromosomes are found in the nucleus of the cell.

Front

What is the expected phenotypic ratio of a monohybrid cross?

Back

The expected phenotypic ratio of a monohybrid cross is 3:1.