Reproduction and Growth in Animals
What is the correct sequence of sperm formation?
Meiotic division during oogenesis is different from that in spermatogenesis. Explain how and why?
It is true that the meiotic division during oogenesis is different from that in spermatogenesis. Following are the details about significant differences between them:
$$*$$ In case of spermatogenesis, meiotic division begins at the time of puberty. This is the time when spermatogenesis begins in a male. On the other hand, oogenesis begins in the female when the female is still in the womb. Thus. It can be said that the meiotic division during oogenesis begins when the girl child is still in the womb.
$$*$$ Formation of primary oocytes stop by the 20th week of gestation of the female child. On the contrary. production of spermatocytes continues throughout the reproductive phase of a male.
$$*$$ In case of spermatogenesis. all the stages of meiosis take place quickly after one another and there is no time lag between them. In the case of oogenesis, meiosis is suspended at the Prophase I state.
$$*$$ Meiosis resumes only once the puberty begins.
Following are some possible reasons for this difference in patterns of oogenesis and spermatogenesis:
$$*$$ Male gametes need to be formed in a very large number to ensure fertilization.
$$*$$ Female gametes are not exposed to external hazards and hence a fewer number of them would be enough. Limiting the production of female gametes helps In the conservation of resources from the female body. The resources can then be properly utilized during the development of foetus.
What is the correct sequence of sperm formation?
Define spermiogenesis and spermiation.
In humans, at the end of the fist meiotic division, the male germ cells differentiate into the _______________.
2n = 16 is in a Primary spermatocyte which is in metaphase of first meiotic division. What shall be the total number of chromatids in each of the secondary spermatocyte?
How many sperms do produce from 4 primary spermatocytes?
The process of release of spermatozoa from Sertoli cells into cavity of the seminiferous tubules is called
The correct sequence of spermatogenetic stages leading to the formation of sperms in a mature human testis is
The given table shows differences between spermatogenesis and spermiogenesis. Select the incorrect option.
Give the names and functions of the hormones Involved In the process of spermatogenesis. Write the names of the endocrine glands from where they are released.
In humans, at the end of the first meiotic division, the male germ cells differentiate into the