Which one of the following statements about morula in humans is correc...
Morula is a solid ball contained within the zone pellucida. It has almost equal quantity of cytoplasm as an uncleaved zygote but much more DNA.
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Which one of the following statements about morula in humans is correc...
The correct answer is option 'A': It has almost equal quantity of cytoplasm as an uncleaved zygote but much more DNA.
The morula is a stage of embryonic development that occurs after the zygote undergoes multiple rounds of cell division. It is characterized by a solid ball of cells that are tightly packed together. Let's explore why option 'A' is the correct statement about the morula in humans.
Explanation:
1. Cytoplasm in the Morula:
- The cytoplasm is the fluid-filled region inside the cell, which contains various organelles and molecules necessary for cellular processes.
- During the early stages of development, the zygote divides through a process called cleavage, resulting in multiple cells without an increase in cytoplasmic volume.
- Therefore, the morula has almost equal quantity of cytoplasm as an uncleaved zygote because the cytoplasm is divided among the daughter cells.
2. DNA in the Morula:
- DNA is the genetic material that carries the instructions for the development and functioning of an organism.
- Each cell in the morula contains the same amount of DNA as the original zygote because the DNA is replicated during the S phase of the cell cycle.
- As the zygote divides, the DNA is distributed equally among the daughter cells, resulting in each cell of the morula having the same amount of DNA as the uncleaved zygote.
- Therefore, the morula has much more DNA than an uncleaved zygote because the DNA is replicated during cell division.
Conclusion:
Based on the above explanations, the correct statement is option 'A': The morula has almost equal quantity of cytoplasm as an uncleaved zygote but much more DNA. The cytoplasm is divided among the daughter cells during cleavage, resulting in almost equal amounts in each cell. However, the DNA is replicated during cell division, leading to a higher amount of DNA in each cell of the morula compared to the uncleaved zygote.
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