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