Punnett Squares

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

Where are the parent alleles written in a Punnett Square?

Back

Outside of the boxes (top and left side).

Front

In a genetic cross Tt x Tt, what is the probability of producing a short plant?

Back

25%.

Front

What are the possible offspring genotypes when crossing two heterozygous parents (Gg)?

Back

GG, Gg, gg.

Front

What is the genotype for a yellow plant if G = green and g = yellow?

Back

gg.

Front

What does it mean if two brothers have the same phenotype but different genotypes?

Back

They display the same physical traits but have different genetic makeups.

Front

What is the definition of a dominant allele?

Back

A dominant allele is an allele that expresses its trait even when only one copy is present.

Front

What is a recessive allele?

Back

A recessive allele is an allele that only expresses its trait when two copies are present.

Front

How do you determine the phenotype from a genotype?

Back

The phenotype is the observable physical or biochemical characteristics determined by the genotype.

Front

What is the purpose of a test cross?

Back

A test cross is used to determine the genotype of an individual with a dominant phenotype by crossing it with a homozygous recessive individual.