Punnett Square Practice

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 (e.g., AA or aa).

Front

What does heterozygous mean?

Back

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

Front

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

Back

25%.

Front

What is the genotype for a tall plant if T is dominant and t is recessive?

Back

TT or Tt.

Front

What is the phenotype of a plant with genotype tt?

Back

Short plant.

Front

How do you determine the probability of offspring genotypes using a Punnett Square?

Back

By filling in the square with the alleles from each parent and calculating the ratios of the resulting genotypes.

Front

What are alleles?

Back

Alleles are different forms of a gene that can exist at a specific locus on a chromosome.

Front

What is the expected genotype ratio from a monohybrid cross?

Back

1:2:1 (1 homozygous dominant : 2 heterozygous : 1 homozygous recessive).

Front

What does it mean if a trait is dominant?

Back

A dominant trait is one that is expressed in the phenotype even if only one allele is present.