Punnett Square Practice

Front

What is a Punnett Square?

Back

A Punnett Square is a diagram used to predict the genotypes of a particular cross or breeding experiment.

Front

What are genotypes?

Back

Genotypes are the genetic constitution of an individual, represented by the alleles inherited from the parents.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Front

What are phenotypes?

Back

Phenotypes are the observable physical or biochemical characteristics of an organism, determined by its genotype.

Tags

NGSS.HS-LS4-4

Front

What does homozygous mean?

Back

Homozygous refers to having two identical alleles for a particular gene (e.g., TT or tt).

Front

What does heterozygous mean?

Back

Heterozygous refers to having two different alleles for a particular gene (e.g., Tt).

Tags

NGSS.HS-LS3-2

Front

What is the expected phenotype ratio from a monohybrid cross of two heterozygous parents?

Back

The expected phenotype ratio is 3:1, with three showing the dominant trait and one showing the recessive trait.

Front

What is the probability of obtaining a homozygous recessive offspring from a cross between two heterozygous parents?

Back

The probability is 25%.

Front

What is the significance of dominant and recessive alleles?

Back

Dominant alleles mask the effect of recessive alleles in heterozygous individuals.

Front

How do you determine the possible genotypes from a Punnett Square?

Back

By filling in the square with the alleles from each parent, you can determine the possible combinations of alleles for the offspring.

Tags

NGSS.HS-LS3-2

Front

What is the genotype of an offspring that shows a dominant phenotype but has a heterozygous parent?

Back

The genotype could be either homozygous dominant (e.g., TT) or heterozygous (e.g., Tt).