Question

the total number of chromosomes in a normal human body cell are
A) 22
B) 23
C) 44
D) 46
E) n

Answer 1

Hint: Humans have chromosomes in pairs. The copy of each chromosome is inherited from the female parent and the male parent. Males chromosomes are different from female chromosomes which are known as sex chromosomes. If enough copies of chromosomes will not be inherited then it leads to a serious problem.

Complete step by step answer:
Chromosomes are thread- like structures and carry hereditary information. Chromosomes are made up of protein and one molecule of DNA that contains genetic information that is passed from the parent to the offspring. Humans have 23 pairs of chromosomes. That is a total of 46 no. of chromosomes. The 1 to 22 pairs of a chromosome are called autosomes.

Humans have an additional pair of sex chromosomes called X and Y for a total of 46 chromosomes.
- The combination of X and y chromosomes determines the sex of a person females have two X chromosomes while males have X and Y chromosomes.

Additional information: Autosomes contain genes that are unrelated to the sex of a person. These are similar in males and females.
- One of the X chromosomes in the females is inactivated and known as a Barr body.
- The size of the X chromosome is larger than the Y chromosomes. X chromosomes have more genes as compared to the Y chromosomes.
 X chromosomes never determine the sex of a person only the y chromosome has the genes that determine sex.
So, the correct answer is, "46".

Note:
- There are 23 pairs of chromosomes in humans.out of which 22 pairs are autosomes.
- The X and Y chromosomes are deciding the sex of a person. Females have two no. of X chromosomes and males have one X and one Y chromosomes.
- There 20000 to 22000 genes are contained by human chromosomes and many of them have two or more than two alleles.