The one egg cell that results from meiosis contains most of the cytoplasm, nutrients, and organelles. … The unequal distribution of the cytoplasm during oogenesis is necessary as the zygote that results from fertilization receives all of its cytoplasm from the egg. So the egg needs to have as much cytoplasm as possible.
Why is only one functional female gamete produced as a result of meiosis?
Secondary oocyte again divides by second meiotic division and again give rise to two unequal sized cell. … Thus in a complete oogenesis, three polar bodies and one functional female gamete or ovum through a meiotic division are formed.
How many eggs are produced in meiosis?
Meiosis contains two separate cell divisions, meaning that one parent cell can produce four gametes (eggs in females, sperm in males).
Why single ovum is produced by oogenesis?
Only one egg is produced from 4 haploid cells as a result of meiosis. Oogenesis proceeds with primary oocyte undergoing first meiotic division forming secondary oocyte (haploid). … Hence, one egg results from meiosis which contains the most nutrients, cytoplasm, organelles.
Why does spermatogenesis result in four Spermatids but oogenesis only in one ovum?
Spermatogenesis leads to the formation of four spermatids from each primary spermatocyte, whereas each primary oocyte produces only a single ovum during oogenesis. This is due to the fact that during oogenesis meiotic division is unequal. … The ovum retains the bulk of the cytoplasm and polar bodies degenerate.
What are two errors that can occur during meiosis?
Other mistakes that can occur during meiosis include translocation, in which part of one chromosome becomes attached to another, and deletion, in which part of one chromosome is lost entirely.
How many sperm are produced from 5 primary spermatocytes?
Each primary spermatocyte produces four sperms therefore 5 primary spermatocytes will produce 20 sperms.
Why is meiosis II needed for gamete egg and sperm production?
Meiosis is a type of cell division that reduces the number of chromosomes in the parent cell by half and produces four gamete cells. This process is required to produce egg and sperm cells for sexual reproduction. … Meiosis begins with a parent cell that is diploid, meaning it has two copies of each chromosome.
Does meiosis happen after fertilization?
At fertilization, the secondary oocyte completes meiosis II to form a mature oocyte (23,1N) and a second polar body.
Why is meiosis 2 necessary?
The cells are diploid, therefore in order to distribute the chromosomes eqully among the daughter cells so that they contain half the chromosome , Meiosis II is necessary. … It reduces the chromosome number to half so that the process of fertilisation can restore the original number in the zygote.
Is a sperm a cell?
In the human reproductive process, two kinds of sex cells, or gametes (GAH-meetz), are involved. The male gamete, or sperm, and the female gamete, the egg or ovum, meet in the female’s reproductive system.