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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
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 following is the illustration of the sequence of ovarian events (a − i) in a human female
(i) Identify the figure that illustrates ovulation and mention the stage of oogenesis it represents.
(ii) Name the ovarian hormone and the pituitary hormone that have caused the above mentioned event.
(iii) Explain the changes that occur in the uterus simultaneously in anticipation.
(iv) Write the difference between ‘c’ and ‘h’.
(v) Draw a labeled sketch of the structure of a human ovum prior to fertilization.
Multiple choice question.
The given figure shows human sperm. Various parts of it are labelled as A, B, C, and D. Which labelled part represents acrosome?
Describe the process of spermatogenesis with the help of diagram.
At the time of birth, there are _______________ oocytes in the ovary of a female foetus.
Sex organs produce gametes which are diploid.
At what stage of development are the gametes formed in newborn male and female?
Expand the acronym.
LH
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.
______ undergoes 2nd meiotic division during spermatogenesis.
The human male gamete is usually about ______ in length.
Conversion of spermatid into sperm is called as _______.
Which of the following stage of oogenesis forms a membrane called zona pellucida surrounding it?
The immature male germ cell undergo division to produce sperms by the process of spermatogenesis.
Choose the correct one with reference to the above.
Connective tissue around seminiferous tubules possess endocrine cells called ______.
Identify the wrong statement from the following.
Besides activating the egg another role of a sperm is to carry ______ to egg.
Sperms can be stored for several years in liquid nitrogen with a temperature of ______.
Fetal sex can be determined by examining cells from amniotic fluid looking for:
Growth hormone of pituitary is more effective in ______.
Which of the following cells during gametogenesis is normally diploid?
Capacitation refers to changes in the ______.
What is the difference between a primary oocyte and a secondary oocyte?
How many spermatozoa are formed from one secondary spermatocyte?
Draw a labelled diagram of a section through the ovary.
In our society the women are often blamed for giving birth to daughters. Can you explain why this is not correct?
Which gamete is produced through oogenesis?
What is the primary purpose of gametogenesis in organisms?
