AIPMT PRELIMS 2010 Zoology Cleavage and Morula MCQ Question
Which one of the following statements about morula in humans is correct?
It has more cytoplasm and more DNA than an uncleaved zygote
It has almost equal quantity of cytoplasm as an uncleaved zygote but much more DNA
It has far less cytoplasm as well as less DNA than in an uncleaved zygote
It has more or less equal quantity of cytoplasm and DNA as in uncleaved zygote
Correct Answer
Detailed Explanation
Cleavage divisions are mitotic divisions, in which the single-celled zygote is converted into a multicellular morula. But during cleavage divisions there is no growth of resultant daughter cells/blastomeres. So, the DNA content will increase, but there is no increase or insignificant increase in amount of protoplasm.
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