Question

what would have happened if meiosis not occur during the production of human spearm cell and egg cell

Answer 1

What is Meiosis?

Meiosis is the process that creates gametes, better known as eggs and sperm, which are essential for sexual reproduction. Gametes are formed from germ cells, which are found in the reproductive organs, the testes (males) or the ovaries (females). The germ cells are undifferentiated cells that remain inactive until an organism reaches sexual maturity. When an organism needs to begin reproducing the germ cells become active and undergo meiosis to produce eggs and sperm.

Answer 2

If meiosis did not occur, fusion of gametes would result in a doubling of the chromosomes for each successive reproduced generation.
For example in case of man egg cells and sperm cells like other cells must contain 46 chromosomes.
But if this were so then the union of egg nucleus and sperm nucleus, which takes place during fertilisation would produce a total of 92 chromosomes in zygote.
If it continues, this would be 184, 368 and so on.
This results in formation of abnormalities in each generation.
If meiosis did not occur, there is no genetic variation in the offsprings produced by random fusion of the gametes.
Without meiosis the number of chromosomes are varied in every generation. Hence no species holds its characters and continues it or species’ is disordered