Question

Snails have a diploid chromosome number of 22. After meiosis, the snail’s sperm or egg would have 11 chromosomes.

How many chromosomes would the zygote have after fertilization

Answer 1

it will regain its ploidy, so there will be 33 chromosomes after fertilization in zygote !!

Answer 2

Answer:

22 chromosomes

Explanation:

Diploid (2n) means two set of chromosomes. Each set is received from each parent. In the case of a snail with 22 diploid chromosomes, it means one set of chromosomes (haploid) containing 11 chromosomes was received from each parent. The diploid snail with 22 chromosomes will undergo meiosis (reduction division) to produce a gamete with reduced number of chromosomes (by half) i.e. 11 chromosomes. This means that after meiosis, each haploid gamete (sperm and egg) will contain 11 chromosomes each.

These haploid (n) gametes fuse together in a process called FERTILIZATION to produce a diploid ZYGOTE (2n) i.e. haploid sperm (n) + hapoid egg (n) = diploid zygote (2n). Hence, the number of chromosomes in the ZYGOTE will be 22 since two gametes with 11 chromosomes each are coming together.