Punnett Squares Review

Front

What is a Punnett Square?

Back

A Punnett Square is a diagram used to predict the genotypes and phenotypes of offspring from genetic crosses.

Front

What does the term 'genotype' refer to?

Back

Genotype refers to the genetic makeup of an organism, specifically the alleles it possesses.

Front

What does the term 'phenotype' refer to?

Back

Phenotype refers to the observable physical characteristics of an organism, which result from the interaction of its genotype with the environment.

Front

What is the probability of having a recessive offspring if both parents are heterozygous?

Back

25%.

Front

If one parent has the genotype BB and the other has bb, what are the possible genotypes of the offspring?

Back

All offspring will have the genotype Bb.

Front

What is the probability of having a dominant phenotype if one parent is homozygous dominant and the other is homozygous recessive?

Back

100%.

Front

In a Punnett Square, what does each box represent?

Back

Each box represents a possible genotype of the offspring resulting from the combination of alleles from the parents.

Front

What is the significance of the letters used in a Punnett Square (e.g., B and b)?

Back

The letters represent different alleles, with uppercase letters indicating dominant alleles and lowercase letters indicating recessive alleles.

Front

If a Punnett Square shows a 50% probability for a trait, what does that mean?

Back

It means that there is a 50% chance that the offspring will express that trait.

Front

What is the genotype of an organism that expresses a recessive trait?

Back

The genotype must be homozygous recessive (e.g., bb).