Advertisements
Advertisements
प्रश्न
During reproduction, the chromosome number (2n) reduces to half (n) in the gametes and again the original number (2n) is restored in the offspring. What are the processes through which these events take place?
Advertisements
उत्तर
During gametogenesis, the chromosomal number is reduced by half and then regained through fertilisation.
APPEARS IN
संबंधित प्रश्न
Give the name and function for ‘A’ and ‘B’ from the diagram given below
With the help of diagrammatic representation, explain the process of gametogenesis
The process of release of the ovum from a mature follicle is called ______.
Implantation of embryo occurs in ______.
Explain two main process in sexual reproduction.
In angiosperms, the pollen germinates to produce a pollen tube that carries two gametes. What is the purpose of carrying two gametes when a single gamete can fertilize the egg?
Answer the following type of question Assertion (A) and Reason (R).
(A) - In human males, testes are extra-abdominal and lie in scrotal sacs.
(R) - Scrotum acts as a thermoregulator and keeps the temperature lower by 2°C for normal sperm production.
Complete the analogy.
1 primary spermatocyte : 4 spermatozoa :: 1 primary oocyte : ____________.
Select the correct sequence of oogenesis.
Identify the enzyme released by the sperm which has lytic activity.
Four primary spermatocytes give rise to ______.
The immature male germ cell undergo division to produce sperms by the process of spermatogenesis.
Choose the correct one with reference to the above.
A reaction of granules content which harden the zona pellucida and ensures sure block to polyspermy is ______.
Preparation of sperm before penetration of ovum is ______.
The nutritive cells found in seminiferous tubules are ______.
In spermatogenesis, reduction division of chromosome occurs during conversion of ______.
Acrosome is a type of ______.
During oogenesis, each diploid cell produces ______.
In oogenesis haploid egg is fertilised by sperm at which stage?
Layers of an ovum from outside to inside is ______.
Head of epididymis is called as ______.
Aquatic animals in which fertilisation occurs in water are said to be
In the process of fertilization, this is true:
Follicular atresia is:
Human milk differs from cow's milk because human milk contains:
In human females, meiosis II is not completed until:
The spermatogonia undergo division to produce sperms by the process of spermatogenesis. Choose the correct one with reference to above.
During spermatogenesis meiosis occurs in ______.
During oogenesis the meiotic division is arrested at ______ before fertilization.
