a somatic cell of a fruit fly usually has 8 chromosomes & a fertilized egg cell is a kind of somatic cell ->  a fertilized egg cell of a fruit fly will have 8 chromosomes  a fertilized egg is formed by a sperm and an egg cell fusing together & a sperm cell is a kind of sex cell & an egg cell is a kind of sex cell ->  a fertilized egg is formed by the fusion of two kinds of sex cells, a sperm and an egg cell  a fertilized egg is formed by the fusion of two kinds of sex cells, a sperm and an egg cell & each sex cell provides half the number of chromosomes in a fertilized egg through sexual reproduction ->  the sperm and the egg cell will each provide half of the number of chromosomes in a fertilized egg  a fertilized egg cell of a fruit fly will have 8 chromosomes & the sperm and the egg cell will each provide half of the number of chromosomes in a fertilized egg & 4 is half of 8 -> the sperm and the egg cell each provides 4 chromosomes for the fertilized fruit fly egg