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

What do the letters B and b represent in genetics?

Back

B represents the dominant allele (brown fur) and b represents the recessive allele (white fur).

Front

In a Punnett square, what does a 50% probability for white fur indicate?

Back

It indicates that there is a 50% chance that the offspring will inherit the genotype 'bb' (white fur).

Front

What is incomplete dominance?

Back

Incomplete dominance is a genetic situation where one allele does not completely dominate another, resulting in a blend of traits.

Front

What is codominance?

Back

Codominance is a genetic situation where both alleles in a heterozygote are fully expressed, resulting in offspring with a phenotype that is neither dominant nor recessive.

Front

If a Punnett square shows TT = 25%, Tt = 50%, and tt = 25%, what does this mean?

Back

It means that in a genetic cross, there is a 25% chance of homozygous tall (TT), 50% chance of heterozygous tall (Tt), and 25% chance of homozygous short (tt) offspring.

Front

What is the genotype of a parent that can produce both dominant and recessive traits?

Back

The genotype must be heterozygous, represented as Bb.

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 traits of an organism, which result from the interaction of its genotype with the environment.

Front

How do you determine the probability of a trait using a Punnett square?

Back

You count the number of times a specific genotype appears in the Punnett square and divide it by the total number of possible genotypes.