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 homozygous mean?

Back

Homozygous refers to having two identical alleles for a particular gene, such as AA or aa.

Front

What does heterozygous mean?

Back

Heterozygous refers to having two different alleles for a particular gene, such as Aa.

Front

What is a phenotype?

Back

A phenotype is the observable physical or biochemical characteristics of an organism, determined by both genetic makeup and environmental influences.

Front

What is a genotype?

Back

A genotype is the genetic constitution of an individual, represented by the alleles they possess, such as AA, Aa, or aa.

Front

What is the difference between dominant and recessive alleles?

Back

A dominant allele is expressed in the phenotype even when only one copy is present, while a recessive allele is only expressed when two copies are present.

Front

What is the expected phenotypic ratio of a monohybrid cross?

Back

The expected phenotypic ratio of a monohybrid cross between two heterozygous parents (Aa x Aa) is 3:1.

Front

What is the expected genotypic ratio of a monohybrid cross?

Back

The expected genotypic ratio of a monohybrid cross between two heterozygous parents (Aa x Aa) is 1:2:1.

Front

If a plant has the genotype TT, what is its phenotype?

Back

The phenotype is tall, as T (tall) is dominant.

Front

If a plant has the genotype tt, what is its phenotype?

Back

The phenotype is short, as t (short) is recessive.