Meroblastic cleavage refers to which type of division of eggs?a)totalb)spiralc)incompleted)horizontalCorrect answer is option 'C'. Can you explain this answer?

Question

Answer

Meroblastic cleavage is a type of cleavage that occurs in very yolky eggs like birds in which the egg cytoplasm and not the yolk divides (incomplete division). In such a cleavage, the furrows divide the small amount of active cytoplasm of animal pole or periphery of egg and most of the yolky portion of vegetal pole or central area of egg remains undivided.

Answer

It's incomplete cleavage because only a portion of egg undergoes division.
these type of cleavage is found in Birds and reptiles.

Answer

Meroblastic cleavage is a type of division of eggs that occurs in certain animals where only a portion of the egg undergoes cleavage, leaving a large yolk mass undivided. This type of cleavage is commonly seen in eggs with a significant amount of yolk, such as bird eggs.
Below are the key points explaining meroblastic cleavage:
- Definition: Meroblastic cleavage is a type of incomplete cleavage where only a portion of the egg undergoes division, while the rest of the egg, usually the yolk, remains undivided.
- Occurrence: This type of cleavage is typically observed in eggs with a large amount of yolk, such as bird eggs. In these eggs, the cleavage furrows do not penetrate the yolk completely due to the presence of a dense yolk mass.
- Types: Meroblastic cleavage can be further classified into two types - telolecithal and centrolecithal cleavage. Telolecithal cleavage occurs in eggs with a concentrated yolk mass at one end (e.g., bird eggs), while centrolecithal cleavage occurs in eggs with a yolk mass in the center surrounded by cytoplasm (e.g., insect eggs).
- Result: The end result of meroblastic cleavage is the formation of a blastoderm, which is a disc-like layer of cells that forms on top of the yolk. This blastoderm eventually gives rise to the embryo.
- Significance: Meroblastic cleavage is essential for the development of certain organisms with yolky eggs, as it allows the embryo to form on top of the yolk while still receiving nutrients from it.
In conclusion, meroblastic cleavage is a type of incomplete cleavage that occurs in eggs with a large yolk mass, such as bird eggs. It is a crucial process for the development of organisms with yolky eggs, ensuring the formation of a blastoderm that eventually develops into the embryo.

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