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The process of fertilization,
(a)restores diploid number of chromosomes.
(b)combines characters of two parents which lead to variation.
(c)introduces centrioles which are missing in the ovum.
(d)all of the above

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Important Questions on Human Reproduction
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First phase of embryonic development is

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First cleavage takes place

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Morula reaches uterus days after fertilization.

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The outer layer of cells of morula which absorb nutritive fluid secreted by uterine endometrial membrane is called

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After absorption of nutritive fluid by trophoblast cells, they become flat to form

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The blastocyst stage is reached about days after fertilization.

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The blastula in mammals is referred as

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is the site of implantation.
