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 does it mean if an allele is dominant?

Back

A dominant allele is one that expresses its trait even when only one copy is present in the genotype.

Front

What does it mean if an allele is recessive?

Back

A recessive allele only expresses its trait when two copies are present in the genotype.

Front

In a heterozygous genotype, which allele is expressed in the phenotype?

Back

The dominant allele is expressed in the phenotype.

Front

What is the genotype for a plant with brown eyes if brown is dominant over blue?

Back

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

Front

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

Back

The phenotype is short, as 't' represents the short trait.

Front

What is the probability of getting a homozygous recessive offspring from a cross of Tt x Tt?

Back

The probability is 25%.

Front

What is the genotype for a yellow plant if G = green and g = yellow?

Back

The genotype for a yellow plant is gg.

Front

Which of the following is a purebred dominant genotype: TT, Tt, or tt?

Back

TT is a purebred dominant genotype.

Front

What is the purpose of a Punnett Square in genetics?

Back

The purpose is to visualize and calculate the probability of different genotypes and phenotypes in offspring.