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

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

Correct answer: It has almost equal quantity of cytoplasm as an uncleaved zygote but much more DNA

Solution

During cleavage, the zygote divides repeatedly without significant growth, so the total cytoplasmic amount stays nearly the same. However, DNA content increases because each division duplicates the genome, producing many more nuclei/cells in the morula.

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