Question

How the chromosome number in a new born organism is maintained as a constant after each
successive generation? ​

Answer 1

Meiosis maintains a constant number of chromosomes in a species that reproduces sexually by halving the number of chromosomes in the gamete cells.
While, role of mitosis is to maintain growth of organism, Splicing maintains process of protein synthesis in eukaryotes and metamorphosis is process of change in physical form or structure of organism.
Hence, answer is "Meiosis"

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Answer 2

Explanation:

The number of chromosomes for everything to run smoothly should always be kept constant from generation to generation, each individual should only inherit 23 chromosomes from each progenitor at the time of conception. Thus, if a woman has 46 chromosomes and a man has 46 chromosomes, each one has to transmit to their unborn child half of that amount (23 chromosomes) at the time of fertilisation. And so the unborn child will receive 46 chromosomes, 23 from its female parent and 23 from its male parent = 46 in total.