Ответы
Ex 4
a) Because every person has got a unique combination of genes.
b) It is possible because a gene for blue eyes can stay hidden in a family for generations.
c) Selective breeding is the process whereby scientists and farmers are able to produce the desired result by selecting the best specimen to breed from.
d) Genetic engineering differs from selective breeding in that genetic engineering is not natural at all: genes are removed and added artificially, while in selective breeding the process of removing and adding genes is natural.
Ex 5
a) -- His wife’s eyes are brown
-- Their children’s eyes can be either blue or brown. The possible combinations are: 1 bl+br 2 bl+br 3 bl+bl 4 bl+bl
--- Assuming the couple will have four children, ideally, two of their children will have brown eyes and two of their children will have blue eyes