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Which one of the following statements about morula in humans is correct?
- Option 1)
It has almost equal quantity of cytoplasm as an uncleaved zygote but much more DNA
- Option 2)
It has far less cytoplasm as well as less DNA than in an uncleaved zygote
- Option 3)
It has more or less equal quantity of cytoplasm and DNA as in uncleaved zygote
- Option 4)
It has more cytoplasm and more DNA than an uncleaved zygote
Answers (1)
As we discussed in concept
Cleavage -
The mitotic division or cleavage starts as the zygote moves through the isthmus of the oviduct towards the uterus and forms 2, 4, 8, 16 daughter
cells. The embryo with 8 to 16 blastomeres is called morula.
- wherein
Cleavage divisions are mitiotic division, 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.
Option 1)
It has almost equal quantity of cytoplasm as an uncleaved zygote but much more DNA
This option is correct.
Option 2)
It has far less cytoplasm as well as less DNA than in an uncleaved zygote
This option is incorrect.
Option 3)
It has more or less equal quantity of cytoplasm and DNA as in uncleaved zygote
This option is incorrect.
Option 4)
It has more cytoplasm and more DNA than an uncleaved zygote
This option is incorrect.
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