Punnett Square

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 genotype?

Back

A genotype is the genetic makeup of an organism, represented by the alleles it possesses.

Front

What is a phenotype?

Back

A phenotype is the physical appearance or observable traits of an organism, resulting from the interaction of its genotype with the environment.

Front

If black fur is dominant (B) and white fur is recessive (b), what is the genotype of an organism with black fur?

Back

The genotype could be either BB (homozygous dominant) or Bb (heterozygous).

Front

What is the expected phenotypic ratio of a monohybrid cross?

Back

The expected phenotypic ratio of a monohybrid cross is typically 3:1 for dominant to recessive traits.

Front

What is the expected genotypic ratio of a monohybrid cross?

Back

The expected genotypic ratio of a monohybrid cross is 1:2:1 for homozygous dominant, heterozygous, and homozygous recessive.

Front

What does it mean if an organism is homozygous recessive?

Back

An organism is homozygous recessive if it has two recessive alleles for a trait, such as aa.

Front

In pea plants, if round seeds (R) are dominant to wrinkled seeds (r), what is the phenotype of a plant with genotype Rr?

Back

The phenotype of a plant with genotype Rr is round seeds.