If an egg cell containing the (n+1) number of chromosomes combines with a sperm cell containing the (n) number of chromosomes, what is the result of this union?
a) all future somatic cells of the organism will contain the (2n + 1) number of chromosomes.
b) all future somatic cells of the organism will contain the (2n - 1) number of chromosomes.
c) only certain somatic cells of the organism will contain the (2n + 1) number of chromosomes.
d) all future somatic cells of the organism will contain the normal diploid number of chromosomes.

The answer is A) All future somatic cells of the organism will contain the (2n + 1) number of chromosomes. 

An egg cell and a sperm cell fuse to develop a new organism in a process called a fertilization. As a result, a zygote is formed. When the egg cell containing the (n+1) number of chromosomes combines with a sperm cell containing the (n) number of chromosomes, the zygote will have (n + n + 1), which is (2n + 1) number of chromosomes. The zygote is  the first cell of the new organism. It undergoes mitosis resulting in somatic cells where all of them will contain the same number of chromosomes as the zygote, which is (2n + 1)