Polar Bodies formed during the formation of oocytes are
A. Smaller cells formed due to unequal due to unequal meiosis.
B. Structures which bud off during oogenesis.
C. Structures formed during spermatogenesis
D. Daughter cells formed after mitosis.
Answer
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Hint: Oocytes are gametocytes or germ cells that are involved in reproduction in women. During women's gametogenesis, an oocyte is formed in the ovary. A primordial germ cell (PGC) is formed by the female germ cells and then undergoes mitosis, forming oogonia. During oogenesis, the primary oocytes become oogonia.
Complete answer:
The primary follicles are surrounded by layers of granulosa cells and a fresh theca and called secondary follicles during oogenesis in human females. The secondary follicle becomes a tertiary follicle, which is distinguished by an antrum, a fluid-filled cavity. The theca layer is divided into an internal theca and an external theca external. It is important that the primary oocyte within the tertiary follicle grows in size and completes its first meiotic division at this point.
It is an uneven division, resulting in the creation of a large haploid secondary oocyte and a tiny first polar body. The secondary oocyte retains the majority of the primary oocyte's nutrient-rich cytoplasm. Shortly before fertilization, the secondary oocyte undergoes the second meiotic division. The second meiotic division is also unequal and results in the development of a haploid ovum (ootid) and a second polar body. As a result of unequal division, both polar bodies are formed and do not engage in embryo development.
Hence, the correct answer is option (B).
Note: Oogenesis in the human female reproductive system is a mechanism of development in which a mature ovum becomes the primary egg cell (or ovum). As a primary ovum, the egg cell persists until the time for its release from the ovary comes. The egg then undergoes the division of cells. The nucleus divides in order to allow half of the chromosomes to go to one cell and half to another.
Complete answer:
The primary follicles are surrounded by layers of granulosa cells and a fresh theca and called secondary follicles during oogenesis in human females. The secondary follicle becomes a tertiary follicle, which is distinguished by an antrum, a fluid-filled cavity. The theca layer is divided into an internal theca and an external theca external. It is important that the primary oocyte within the tertiary follicle grows in size and completes its first meiotic division at this point.
It is an uneven division, resulting in the creation of a large haploid secondary oocyte and a tiny first polar body. The secondary oocyte retains the majority of the primary oocyte's nutrient-rich cytoplasm. Shortly before fertilization, the secondary oocyte undergoes the second meiotic division. The second meiotic division is also unequal and results in the development of a haploid ovum (ootid) and a second polar body. As a result of unequal division, both polar bodies are formed and do not engage in embryo development.
Hence, the correct answer is option (B).
Note: Oogenesis in the human female reproductive system is a mechanism of development in which a mature ovum becomes the primary egg cell (or ovum). As a primary ovum, the egg cell persists until the time for its release from the ovary comes. The egg then undergoes the division of cells. The nucleus divides in order to allow half of the chromosomes to go to one cell and half to another.
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