Why is a sperm different to an egg cell?

Answer 1

Sperm are male gametes and eggs are female gametes. In mammals sperm are small and mobile while eggs are large and cannot move (by themselves). Four sperm cells are produced by spermatogenesis while only one egg is produced by oogenesis.

also, sperm cells are known as the "xy" genes and eggs are known s the "xx" genes. during intercourse, a female will always give a "x" and the dad will give out a "y" or a "x". if its "xx", its a girl.if its a "xy", its a male.