Question

give reason:
Gametes have haploid number of chromosomes

Answer 1

here is your answer
In humans all reproduction is sexual. It involves joining together haploid gamete cells from each parent with half the normal number of chromosomes to make a new cell containing both parents' genetic material. This is a diploidzygote. ... When the gametes join they form a cell called a zygote.

Answer 2

because gametes are eggs and sperm,which unite to form a zygote.If both of them were diploid,the zygote would have twice the number of normal chromosomes .Therefore, in order to produce gametes,organisms undergo meiosis to produce to haploid cells.