(a)[2]
Suggest which variety of the insect is likely to be found in the greatest numbers in places where leaf pattern G of the plant occurs, and explain your answer.
(b)[4]
After many years of growth, the plants lose the dots and stripes on their leaves so that the leaves become plain. Suggest and explain what is likely to happen to the numbers of the different insect varieties in an area where most plants are old.
(c)[4]
Two alleles, T and t, determine the body pattern of the insects. Dot-pattern insects (C) are homozygous dominant. Stripe-pattern insects (E) are homozygous recessive. Plain insects (D) are heterozygous. Explain why all three varieties of insect will still be produced even in areas where every plant has plain leaves.