Q. Which one of the following statements about morula in humans is correct?
A) It has more cytoplasm and more DNA than an uncleaved zygote
B) It has almost equal quantity of cytoplasm as an uncleaved zygote but much more DNA
C) It has far less cytoplasm as well as less DNA than in an uncleaved zygote
D) It has more or less equal quantity of cytoplasm and DNA as in uncleaved zygote
Explanation
[Solution from source] Cleavage divisions are rapid mitoses with no growth in between, so the zygote's cytoplasm is just split among the blastomeres while every new cell receives a full copy of DNA. The morula (8–16 cells) therefore has roughly the same cytoplasm as the zygote but many times more DNA. Answer (2).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.