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प्रश्न
At what stage of development are the gametes formed in newborn male and female?
उत्तर
In males, at puberty, the spermatogonia (sperm mother cells) begin to undergo meiotic division and produces sperms throughout life, whereas in females during the stage of foetal development, the germinal epithelial cells undergo mitosis and produce oogonia (egg mother cells) and they further enter prophase I of meiotic division I forming primary oocytes and get arrested. No more oogonia is formed further. At puberty, out of million eggs (prime oocytes) produced at birth only 300-400 will ovulate till menopause.
संबंधित प्रश्न
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.
Define spermiogenesis.
Name the functions - Acrosome of sperm.
Give scientific reason.
There is a menopause when women are 45-50 years old.
If newborns are produced at the age of menopause, they may be with some abnormalities. Why?
The male sex hormone testosterone is secreted from ____________.
Give a schematic representation of spermatogenesis and oogenesis in humans.
Calculate the number of sperms and ova produced from 40 primary spermatocytes and 40 primary oocytes.
Identify the CORRECT sequence of events.
What is the location of oogenesis?
There is no cell division involved in ______.
How many functional sperms and how many ova will be formed by a primary spermatocyte and a primary oocyte.
Cavity of graafian follicle is ______.
A reaction of granules content which harden the zona pellucida and ensures sure block to polyspermy is ______.
Layers of an ovum from outside to inside is ______.
Which of the following is a primary sex organ of female?
In human females, meiosis II is not completed until:
Capacitation refers to changes in the ______.
What is the difference between a primary oocyte and a secondary oocyte?
Process of maturation and development of sperms ______.
