Give the full genotype of the fly numbered 6 in Figure 4.

Genotype =

Give one piece of evidence from Figure 4 to show that the allele for grey body colour is dominant.

Explain one piece of evidence from Figure 4 to show that the gene for body colour is not on the X chromosome.

A heterozygous grey-bodied, white-eyed female fly was crossed with a black-bodied, red-eyed male fly.

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

Phenotypes of parents: Grey-bodied, white-eyed female × Black-bodied, red-eyed male

Genotypes of parents:

Genotypes of offspring

Phenotypes of offspring

Ratio of phenotypes

A population of fruit flies contained 64% grey-bodied flies. Use the Hardy–Weinberg equation to calculate the percentage of flies heterozygous for gene G.