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Hormonal Regulation of the Menstrual Cycle

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How do variations arise in sexually reproducing organisms? Explain very briefly.

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Solution

Independent assortment of chromosomes during meiosis, reciprocal recombination of linked genes on chromosomes by crossing over in prophase-l of meiosis, random fertilization of gametes.

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Q. Short / Long answer type questions
How do variations arise in sexually reproducing organisms? Explain very briefly.

Q. Question 10
Explain how sexual reproduction gives rise to more viable variations than asexual reproduction. How does this affect the evolution of those organisms that reproduce sexually?

Q. Sexually reproducing organisms produce offspring with a marked, significant, and visible variation. Asexually reproducing offspring show minor variations.
i) Do you agree with the above statements?
ii) Among the following organisms point out the asexually reproducing organism (cockroach, Euglena, earthworm, and bird).

Q. Statement 1: All the variations in a species have equal chances of survival.

Statement 2: In asexually reproducing organisms minimum variations are present.

Q. Explain how sexual reproduction gives rise to more viable variations than asexual reproduction. How does this affect the evolution of those organisms that reproduce sexually?

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Hormonal Regulation of the Menstrual Cycle

Standard XII Biology

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