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

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 'gg', what color will it be?

Back

The plant will be yellow, as 'g' is the recessive allele for yellow.

Front

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

Back

The dominant allele is expressed in the phenotype.

Front

What are genotypes?

Back

Genotypes are the genetic makeup of an organism, represented by the alleles it possesses.

Front

What are phenotypes?

Back

Phenotypes are the observable traits or characteristics of an organism, resulting from the interaction of its genotype with the environment.

Front

What is the probability of obtaining a dominant phenotype from a cross between two heterozygous parents (Bb x Bb)?

Back

The probability is 75%.

Front

What does 'homozygous' mean?

Back

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