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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
Draw a sectional view of human ovary and label the different follicular stages, ovum and Corpus luteum.
Draw a diagram of the microscopic structure of human sperm. Label the following parts in it and write their functions
(a) Acrosome
(b) Nucleus
(c) Middle piece
The process of release of the ovum from a mature follicle is called __________.
Ovulation is induced by a hormone called __________.
Identify True/False statement. Correct false statement to make it true.
Oogenesis takes place in corpus luteum.
At the time of birth, there are _______________ oocytes in the ovary of a female foetus.
The process which the sperm undergoes before penetrating the ovum is ____________.
Define gametogenesis.
Which of the following is diploid?
How many autosomes does a human primary spermatocyte have?
The head of the epididymis at the head of the testis is called ______.
The prostate gland and seminal vehicle perform the function of ______.
Mark the odd one.
If for a species 2n = 16, then during Ist prophase and IInd prophase of the meiotic division of a cell, how many tetrads and diads will be formed:
Human milk differs from cow's milk because human milk contains:
Capacitation refers to changes in the ______.
The mother germ cells are transformed into a mature follicle through series of steps. Provide the missing steps in the blank boxes.
What is the difference between a primary oocyte and a secondary oocyte?
During spermatogenesis meiosis occurs in ______.
Name the germinal layers from which the following organs develop: Tongue, heart, sweat glands, vagina, mammary glands, kidney.
