Gametogenesis: What Science reveals
Introduction
When talking about gametogenesis it is essential to know certain things about DNA and chromosomes.
The first thing we should know is that all the cells of our body have a total of 46 chromosomes These cells as they receive the name somatic cells are 46 chromosomes are grouped are grouped into 23 pairs, 23 gives us our mother and 23 our father. We must know that the exception to the rule is sexual cells, the cells that we provide to leave our offspring.
In men the sexual cell is sperm, while in women the mature sex cell is the ovule and each of these more of having 46 chromosomes has only half that would be 23.
Haploidía as a concept we define it as the number of complete chromosomes games in 1 cell, in the human being the haploid number is 23 chromosomes, we have 23 chromosomes is a complete game that we can give to our offspring is why sex cells that only 23 chromosomes are called haploid.
We must know what immature sex cells when they want to mature and complete the only 23 chromosomes.
Meiosis is a cell division which consists that a cell with 46 chromosomes will give you a total of 4 cells with 23 chromosomes, the first thing this cell will do is duplicate or replicate each of the chromosomes.
The first cell to start meiosis is a diploid cell, would continue to be the 46 chromosomes but each of them is replicated, so it is called a bivalent or replicated diploid, bivalent means that it has two valences in this case that is replicated and It would represent as a 46 by 2, now that the bivalent diploid cell has replicated its DNA, it will start the meiosis 1 where half of each of the chromosomes will go to its side and the other half on the other side on the other side. This is why the second cell already reduced the genetic material to 23 but continues each of them with its replica that is why being 23 are called haploid and we add bivalent because it has its replica and represent the chromosomes serious 23 by 2 but The objective is to have 23 that is why each of these cells suffer from the meiosis 2 in which each of them will depart in two others giving rise to the four which will be each without replica and in each one We would have a chromosome and since they are no longer replicated they receive the monovalent haploid name that is the objective of the meiosis of a bivalent diploid cell to reach four cells that are haploid but also simple that are monovalent.
conclusion
In the case of male gametogenesis, the first divalent diploid cell in man is called primary spermatocy They are still bivalent and each of them when making meiosis 2 in the end give us a result of four spermátidas are already a monovalent haploid where they only have their 23 simple chromosomes.
In the case of women we have that the first bivalent diploid cell is called primary oocy Polar body name that is also bivalent haploid and then each of them is divided and makes meiosis 2 and the secondary oocyte comes out of a single cell that is going to serve us called an ovule and another second cell that will not serve us what the polar body name.
In the man of a primary spermatocyte, four spermátidas that will serve us arise and they will become sperm while in the wife of a primary oocyte only one cell arises and three cell subtraction called polar bodies really does not really serve us
Leave feedback