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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?
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उत्तर
During gametogenesis, the chromosomal number is reduced by half and then regained through fertilisation.
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संबंधित प्रश्न
How is 'oogenesis' markedly different from 'spermatogenesis' with respect to the growth till puberty in the humans?
Ovulation is induced by a hormone called ______.
Define spermiogenesis.
Identify True/False statement. Correct the false statement to make it true.
Oogenesis takes place in the corpus luteum.
Name the functions - Acrosome of sperm.
Describe the process of oogenesis in human female.
At the time of birth, there are _______________ oocytes in the ovary of a female foetus.
What is gamete formation?
Sex organs produce gametes which are diploid.
The male sex hormone testosterone is secreted from ____________.
Answer the following type of question Assertion (A) and Reason (R).
(A) - Head of the sperm consists of acrosome and mitochondria.
(R) - Acrosome contains spiral rows of mitochondria.
Define gametogenesis.
Expand the acronym.
hCG
The secondary oocyte enter into the fallopian tube through the ______.
Which of the following are known as the nourishing cells present in the seminiferous tubules?
Calculate the number of sperms and ova produced from 40 primary spermatocytes and 40 primary oocytes.
Identify the enzyme released by the sperm which has lytic activity.
Find out the CORRECT sequence of spermatogenesis.
Which of the following contains a fluid filled cavity called antrum?
Identify the wrong statement from the following.
How many functional sperms and how many ova will be formed by a primary spermatocyte and a primary oocyte.
Preparation of sperm before penetration of ovum is ______.
Which of the following groups of cells in the male gonad, represent haploid cells?
Head of epididymis is called as ______.
Mark the odd one.
Read the following and answer from given below:
Oogenesis is the process of the formation of an ovum in the ovaries. It consists of three phases: multiplication, growth, and maturation. Oogenesis is controlled by hormones GnRH, LH, FSH. GnRH secreted by the hypothalamus stimulates the anterior lobe of the pituitary gland to secrete LH and FSH.
Which cell division is involved in the formation of secondary oocytes?
The region of the root tip whose cells undergo rapid elongation and enlargement and are responsible for the growth of the root in length is called the:
Germ cells present in the seminiferous tubules undergo ______
What is the difference between a primary oocyte and a secondary oocyte?
Meiotic division of the secondary oocyte completed ______.
