NEET BIOLOGY

Detailed explanation-1: -Explanation: If the meiosis does not occur during production of gametes (sperm cells and egg cells) then the number of chromosomes would increase for every person in every generation. Meiosis occurs for the reductional division and the chromosome number in the gamete becomes haploid.

Detailed explanation-2: -Without meiosis, the number of chromosomes will not remain constant in a species across generations and will be duplicated every time after sexual reproduction. An organism will not be able to reproduce effectively by sexual reproduction without meiosis.

Detailed explanation-3: -Because meiosis creates cells that are destined to become gametes (or reproductive cells), this reduction in chromosome number is critical-without it, the union of two gametes during fertilization would result in offspring with twice the normal number of chromosomes!

Detailed explanation-4: -If meiosis does not occur properly, an egg or sperm could end up with too many chromosomes, or not enough chromosomes. Upon fertilization, the baby could then receive an extra chromosome, or have a missing chromosome.

Detailed explanation-5: -Mistakes during mitosis lead to the production of daughter cells with too many or too few chromosomes, a feature known as aneuploidy. Nearly all aneuploidies that arise due to mistakes in meiosis or during early embryonic development are lethal, with the notable exception of trisomy 21 in humans.