If half the total number of chromosomes that is 23 from both tha male and the female gametes fuse to form a baby of normal 46 chromosomes, then how the sperms or eggs produced by this baby when it become adult contain only 23 chromosomes and not 46 normal chromosomes?

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Solution

Dear Student,
Gametes are produced as a result of meiosis which is reductional division. When two gametes belonging to opposite sexes combine then the chromosome number is restored back. Thus halving of the chromosome number in gametes maintains the chromosome number of a species.
Regards,

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Mohan’s mother has delivered a baby girl. He wants to know from his teacher how eggs get converted into a baby boy or a baby girl. The teacher tells him that there are two types of sex chromosomes X and Y. The fusion of these sex chromosomes through gametes leads to the birth of a baby boy or a baby girl. Baby girl is born when a sperm containing

Q. A normal cell of human body contains 23 pairs of chromosomes. The number of chromosomes in a sex cell (sperm or ovum) of a human being is most likely to be :
(a) 46
(b) 23
(c) 21
(d) 42

State whether the following statements are true or false :

(a) The estrogen hormone develops deeper voice in males at puberty.

(b) Menstruation stops in men permanently around the age of 45 to 50 years.

(d) The sex chromosomes in all the gametes (sperms) of a man are not identical.

(e) Half the female gametes contain X chromosomes and the other half contain Y chromosomes.

(f) It is the sperm which determines the sex of a child.

(g) Each normal cell in our body contains 23 chromosomes.

(h) A girl should not be allowed to work in the kitchen during menstruation.

(i) A woman (mother) is responsible for the sex of her child.

(j) Metamorphosis in insects (like silk moth) is brought about by thyroxine hormone.

Q. There are 46 chromosomes in total and then gets divided and becomes 23.What is the difference between these two types of chromosomes and the rest 46?

Q. If the female gamete carries 22+XX chromosomes, while male gamete is normal, predict the probable defects in the baby formed as a result of fusion between these gametes.
i. Triple X syndrome
ii. Klinefelter’s syndrome
iii. Turner’s syndrome
iv. Edward’s syndrome

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If half the total number of chromosomes that is 23 from both tha male and the female gametes fuse to form a baby of normal 46 chromosomes, then how the sperms or eggs produced by this baby when it become adult contain only 23 chromosomes and not 46 normal chromosomes?

Dear Student, Gametes are produced as a result of meiosis which is reductional division. When two gametes belonging to opposite sexes combine then the chromosome number is restored back. Thus halving of the chromosome number in gametes maintains the chromosome number of a species. Regards,

Dear Student,
Gametes are produced as a result of meiosis which is reductional division. When two gametes belonging to opposite sexes combine then the chromosome number is restored back. Thus halving of the chromosome number in gametes maintains the chromosome number of a species.
Regards,