What is meant by the term phenotype?

The inheritance of fruit colour in summer squash plants is controlled by two genes, A and B. Each gene has two alleles.

Name the type of gene interaction shown in Figure 7.

What fruit colour would you expect the following genotypes to have?

AAbb

aaBB

Genes A and B are not linked.

Complete the genetic diagram to show all the possible genotypes and the ratio of phenotypes expected in the offspring of this cross.

Genotypes of parents: aabb × AaBb

Genotypes of offspring

Phenotypes of offspring

Ratio of phenotypes

A population of summer squash plants produced only green and yellow fruit. The percentage of plants producing yellow fruit in this population was 36%.

Use the Hardy−Weinberg equation to calculate the percentage of plants that were heterozygous for gene B.

Answer ______________ %