# NEET BIOLOGY

## REPRODUCTION

### REPRODUCTION IN ORGANISMS

 Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
The ratio of number of chromosomes in a human zygote and a human sperm is:
 A 2:1 B 3:1 C 1:2 D 1:3
Explanation:

Detailed explanation-1: -The human sperm and egg have 23 chromosomes each. So when they fuse together, the zygote formed has 23+23=46 chromosomes. So the required ratio is 46 : 23, i.e., 2 : 1.

Detailed explanation-2: -The number of chromosomes in a human sperm is half the number of chromosomes in a zygote, i.e., their ratio is 2 : 1.

Detailed explanation-3: -The ratio is 1:2 of chromosome number between an egg and its zygote. Sperms contain either X or Y chromosome whereas an egg will always have an X chromosome.

Detailed explanation-4: -Ratio. During mammalian spermatogenesis, meiosis produces 50:50 ratio of X and Y spermatozoa according to Mendelian segregation. Therefore, the natural sex ratio during spermatogenesis is expected to be 1:1 (Umehara et al., 2019).

Detailed explanation-5: -Normally, each cell in the human body has 23 pairs of chromosomes (46 total chromosomes). Half come from the mother; the other half come from the father.

There is 1 question to complete.