Question

describe the stages of oogenesis​

Answer 1

Answer:

Explanation:

Oogenesis​  is the process of Formation of ovum inside the ovary.

IT CONSISTS OF 3 PHASES : i) Multiplication

                                                  ii) Growth

                                                  iii) Maturation

i) Multiplication : In the multiplication phase, some cells of the germinal epithelium of ovary function as primary germ cells and are called oogonia, which multiply by repeated mitotic division and become primary oocytes when cell division ceases.

ii) Growth : In the growth phase, the increase in the size of the primary oocyte is very considerable. It is a slow process and may take a long period. In human female, the oogonia are already formed at the time of birth and continue growth only after attaining sexual maturity. It contains a diploid number of chromosomes.

iii) Maturation : In the maturation phase, the primary oocyte undergoes first meiotic division and gives rise to two daughter cells, larger one called secondary oocyte and a smaller one as a first polar body. The secondary oocyte divides again and gives rise to haploid ootid or the ovum and the second polar body. Thus, one ovum is formed from one primary oocyte as a result of oogenesis.

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Answer 2

Answer:

Oogenesis is the process of the formation of a mature ovum from the oogonia in females. It takes place in the ovaries. During oogenesis, a diploid oogonium or egg mother cell increases in size and gets transformed into a diploid primary oocyte. This diploid primary oocyte undergoes first meiotic division i.e., meiosis I or reductional division to form two unequal haploid cells. The smaller cell is known as the first polar body, while the larger cell is known as the secondary oocyte.  

This secondary oocyte undergoes second meiotic division i.e., meiosis II or equational division and gives rise to a second polar body and an ovum. Hence, in the process of oogenesis, a diploid oogonium produces a single haploid ovum while two or three polar bodies are produced. There are three major stages of oogenesis -  

1) Multiplication phase  

2)Growth phase

3)Maturation phase.