In an egg, the type of cleavage is determined by:
Correct answer: A. The amount and distribution of yolk
- A. The amount and distribution of yolk
- B. The number of egg membranes
- C. The shape and size of the sperm
- D. The size and location of the nucleus
Explanation
The amount of yolk and how it is distributed determines the type of cleavage. On this basis cleavage is of two types: (i) Holoblastic (total cleavage) where the segmentation line passes through the entire egg. It occurs in alecithal (without yolk), microlecithal (with very little amount of yolk) and mesolecithal (little amount of yolk) egg. (ii) Meroblastic (partial cleavage) where segmentation line does not pass through the egg and remained confined to a part of the egg. It occurs in megalecithal (large amount of yolk) egg.
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Human reproduction covers the male and female reproductive organs, gamete formation, fertilization, implantation and hormonal regulation. The menstrual cycle includes ovarian and uterine changes controlled by pituitary and ovarian hormones, while sexually transmitted diseases are studied through their causes, transmission, symptoms, prevention and effects on fertility.
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