How does the number of chromosomes in sex cells compare with the number of chromosomes in the body?

Sex cells have 23 chromosomes compared to the body cells' 46 chromosomes. This is because a child is created from half the genome of its father and half the genome of its mother.

In other Words, 23 chromosomes in the mother's egg and 23 chromosomes in the father's sperm, when combined generate a child with 46 chromosomes in its body cells.

However, sometimes mutations occur where more of fewer chromosomes are passed down, this will either result in no embryotic development or the embryo having some kind of syndrome.