- 1(current)
Q. No.The primary oocyte divides to produce:
| 1. | A large diploid secondary oocyte and a small haploid first polar body |
| 2. | A large haploid secondary oocyte and a small haploid first polar body |
| 3. | A large diploid secondary oocyte and a small haploid second polar body |
| 4. | A large haploid secondary oocyte and a small haploid secondary polar body |
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Consider the given statements:
I. Primary oocyte begins meiosis I embryonic development, but gets arrested in the diplotene stage of prophase I until puberty.
II. Immediately after meiosis I, the haploid secondary oocyte initiates meiosis II but gets arrested at metaphase II stage until fertilization, if such should ever occur.
III. If the secondary oocyte is not fertilized it does not complete meiosis II and doesn't become an ovum.
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
The hypothalamus and the pituitary gland mainly control the menstrual cycle. A series of physiological and anatomical processes of puberty culminates in menarche. Which of the following is the most important causal reason for the onset of puberty?
| 1. | The release of pulses of GnRH by the hypothalamus |
| 2. | The release of gonadotropins by the anterior pituitary |
| 3. | Inhibition of GnRH due to increase in circulating gonadotropins |
| 4. | Secretion of estrogen by the ovaries in response to pituitary hormones |
- 1(current)
Q. No.
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