NEET 2010 Biology question

Which one of the following statements about morula in humans is correct

(1)It has far less cytoplasm as well as less DNA than in an uncleaved zygote
(2)It has more or less equal quantity of cytoplasm and DNA as in uncleaved zygote
(3)It has more cytoplasm and more DNA than an uncleaved zygote
(4)It has almost equal quantity of cytoplasm as an uncleaved zygote but much more DNACorrect

Answer: (4)

Solution

Cleavage is a series of rapid mitotic divisions of the zygote in which no growth occurs between divisions; the cells (blastomeres) become smaller, so the morula (a solid ball of 8-16 cells) has about the same total cytoplasm as the uncleaved zygote.

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Question ID VK-090594