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In an egg, the type of cleavage is determined by
[1995]
- a)shape and size of the sperm
- b)size and location of the nucleus
- c)amount and distribution of yolk
- d)number of egg membranes
Correct answer is option 'C'. Can you explain this answer?
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Verified Answer
In an egg, the type of cleavage is determined by[1995]a)shape and size...
The amount of yolk and its distribution determines the type and depth of cleavage. Cleavage is effected due to yolk resulting in different types of segmentation or cleavage.
Most Upvoted Answer
In an egg, the type of cleavage is determined by[1995]a)shape and size...
Explanation:
Cleavage is the process of cell division that occurs after fertilization of an egg cell by a sperm cell. The type of cleavage that occurs in an egg is determined by the amount and distribution of yolk present in the egg.
Yolk is a nutrient-rich substance that is stored in the egg to support the development of the embryo. The amount of yolk present in an egg varies among different species, and the type of cleavage that occurs in the egg is adapted to the amount and distribution of yolk.
Types of cleavage based on yolk distribution:
1. Isolecithal cleavage: In eggs that have a small amount of yolk that is uniformly distributed throughout the egg, cleavage occurs evenly and produces blastomeres of equal size. This type of cleavage is found in organisms such as sea urchins and frogs.
2. Mesolecithal cleavage: In eggs that have a moderate amount of yolk that is concentrated at one end of the egg, cleavage occurs only in the yolk-free cytoplasm at the animal pole, producing a small blastula on top of a large yolk mass. This type of cleavage is found in organisms such as fish and reptiles.
3. Telolecithal cleavage: In eggs that have a large amount of yolk that is concentrated at one end of the egg, cleavage occurs only in the small amount of cytoplasm at the animal pole, producing a disc-shaped blastula on top of a large yolk mass. This type of cleavage is found in organisms such as birds and mammals.
Therefore, the correct answer is option C, which states that the type of cleavage in an egg is determined by the amount and distribution of yolk.
Cleavage is the process of cell division that occurs after fertilization of an egg cell by a sperm cell. The type of cleavage that occurs in an egg is determined by the amount and distribution of yolk present in the egg.
Yolk is a nutrient-rich substance that is stored in the egg to support the development of the embryo. The amount of yolk present in an egg varies among different species, and the type of cleavage that occurs in the egg is adapted to the amount and distribution of yolk.
Types of cleavage based on yolk distribution:
1. Isolecithal cleavage: In eggs that have a small amount of yolk that is uniformly distributed throughout the egg, cleavage occurs evenly and produces blastomeres of equal size. This type of cleavage is found in organisms such as sea urchins and frogs.
2. Mesolecithal cleavage: In eggs that have a moderate amount of yolk that is concentrated at one end of the egg, cleavage occurs only in the yolk-free cytoplasm at the animal pole, producing a small blastula on top of a large yolk mass. This type of cleavage is found in organisms such as fish and reptiles.
3. Telolecithal cleavage: In eggs that have a large amount of yolk that is concentrated at one end of the egg, cleavage occurs only in the small amount of cytoplasm at the animal pole, producing a disc-shaped blastula on top of a large yolk mass. This type of cleavage is found in organisms such as birds and mammals.
Therefore, the correct answer is option C, which states that the type of cleavage in an egg is determined by the amount and distribution of yolk.
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Community Answer
In an egg, the type of cleavage is determined by[1995]a)shape and size...
Amount and distribution of yolk in egg determines the type of cleavage in an egg during development.
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In an egg, the type of cleavage is determined by[1995]a)shape and size of the spermb)size and location of the nucleusc)amount and distribution of yolkd)number of egg membranesCorrect answer is option 'C'. Can you explain this answer?
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