What is the difference between oogenesis spermatogenesis from?

In this work, we propose to identify the difference from oogenesis spermatogenesis, to talk about within these processes. Of course, we will not leave without attention and sex cells, and explain their structure and functions.

Reproduction – this is the main purpose of all living beings on our planet, it helps to continue the race, that is our planet will never be empty. On the contrary, the number of living creatures, especially people, is growing exponentially. The egg and sperm-the sex cells that women and men respectively. It will be the subject of our article. Under the gametogenesis refers to the process of formation of sex cells. If we are talking about the sperm, it is called spermatogenesis, if the ovum, ovogenesis. All this in more detail you can find below.

Gametogenesis

Ovogenesis and spermatogenesis, the difference between which not very many of his traits are similar, can be considered as one General term – “gametogenesis”. Now this is a little bit more.

To begin, let us examine the notion, we can identify two words: "gamete" and "Genesis", the latest Greek can be translated as – "the origin". That is literally the term "gametogenesis" means "the origin of the gametes". Gametes-sex cells that, in men-sperm, women – egg. The gametogenesis can also be divided by sex: gametogenesis occurring in the male body is called spermatogenesis and in the body women – ovogenesis. But here we come to the first difference of these processes. The oogenesis begins before birth in the light girls, and spermatogenesis seen in boys who have reached a certain age, typically 12-13 years old.

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Puberty girls

The formation of ova, that is, ovogenesis, is still in the womb, while puberty, or rather its first stage, for about nine years. Offer a little more to consider stages of puberty girls:

• 1st stage-increased growth, there are cases when a girl gets more than 10 inches in height, it is considered normal. As a rule, girls are outperforming boys.
• Level 2 – changing secondary sexual characteristics. Around 12 years old girl begins to get out of the way of the ugly duckling. Begins to grow Breasts, reduces waistline, grow hair in the pubic area and in armpits. At about this stage the egg preserved Wake up and begin their further development. Soon the girl learns what a period.
• 3rd stage-final stage. He has approximately 18 years. Now she is considered to be fully formed, it can reproduce healthy offspring.

Puberty boy

As we mentioned earlier, the girls formed eggs still in the womb, boys are all a little different. Sperm begin their development only when it reaches 12-14 years. Before this stage of puberty there are also changes:

• Increase in penis size;
• Enlargement of the scrotum;
• Grow pubic hair, armpits, legs and face.

Upon reaching the 12-14 years old boy can already start to be sexually active, but it is necessary for parents to warn him, because he already can cause unwanted early pregnancy of his companion. We now proceed directly to the male and female germ cells, we consider their structure, stages of formation, similarities and differences.

The Egg

Let's Start with the female germ cells, characteristic of oogenesis will be discussed later. To start propose to consider the structure and functions of eggs.

The Egg is relatively large and immobile cell, its dimensions reach 170 µm, which is much more of male germ cells (up to 70 µm). Each one contains essential nutrients, there we will see:

• Substances needed for protein biosynthesis;
• Regulatory substances;
• Yolk.

Cells can divide by the number of egg yolks

• Altitalia;
• Polozitelnye;
• Methacycline;
• Oligodactylia.

From a negligible amount to a very large, respectively. If we consider the woman's egg, it can be attributed to altitalia and solicitarea type. That is, there's little of the yolk, which can be explained by the fact that the human fetus rapidly goes to gematotropnye type of food. Isolecithal type means that the yolk is distributed evenly and the core is at the center.

The Egg has the following shell:

• The cytoplasm;
• Protective shell;
• Radiant crown.

All shells have a protective function, do not allow to penetrate the egg more than one sperm is needed for fertilization. All the others are blocked.

Now select the functions of the egg:

• Providing the embryo with energy;
• Provide at the initial stage of the embryo nutrients.

Sperm

We All know that sperm – a male reproductive cell, but itwork? Offer a bit to understand this issue. The appearance of gametes you can see in the photo in this section. In its structure we can distinguish the following parts:

• Head;
• Neck;
• The middle part;
• A tail.

Head of sperm filled the nucleus, it carries genetic information. During fertilization the egg passes. The sex of the baby depends on the sperm. If he carries an X chromosome, then a girl, if Y, then the boy.

The Neck is represented by small constriction before the middle part of the sperm, this part is responsible for active movement, or fertilization would be impossible.

Next comes the body, which also produces energy for the movement of gametes. The tail is represented by a flagellum that performs a very important task – to move.

Before we consider the features of spermatogenesis and oogenesis, we propose to highlight the primary function of sperm – is bringing the genetic material to the oocyte.

Ovogenesis

Let's Start with the education of the female sex cell, highlight the periods of oogenesis and characterize each of them. Thus, there are phases:

• Organizations;
• Growth;
• Maturity.

Now we can call the first difference of from oogenesis spermatogenesis: in the first case is the origin of female germ cells (oocytes) and the second male (sperm). Let's describe each stage of oogenesis.

The process of reproduction available in the initial parenchyma cells (embryonic) are divided by mitosis. Thus, in the cortical layer of the ovaries, the accumulation ovogonij. They accumulate:

• Whites;
• Fat;
• Glucose.

Now they are very different from their predecessors, the resulting ovogonii much larger zachodowi, but their genetic makeup is identical. It is important to note that this process takes place before the birth of the girls, that is in the womb.

The Next stage occurs shortly before the appearance of the girls on the light. This stage is called growth. Now there is a division by mitosis, so are formed the oocytes of the first order. Compared to ovogoniâmi they be less, but then quickly increase in size. Now the oocytes will have a small difficulty, they find themselves in captivity granulosa shell and stop developing at the stage of primordial follicle. All these cells there are about two million, but further development will be only some of them (about 450).

The Third stage (maturation) occurs shortly before the appearance of the first menstruation of a girl. One of the dormant follicles waking up and continues its development until it stopped about 12-13 years ago.

Spermatogenesis

We have identified one difference from ovogenesis spermatogenesis (developing different sex cells) from the reading can also highlight the fact that a oogenesis begins before birth girls, but the process of spermatogenesis by 12-14 years. We have identified two differences, then we again denote is to consolidate the knowledge.

Stages of spermatogenesis are also slightly different from the stages of oogenesis (presence of another phase). There are the following steps spermatogeneza:

• Razmnozhenie;
• Rest;
• Sozrevanie;
• Formirovanie.

Here we see the similarity of these processes, the first three stages are the same, only at the stage of maturation oogenesis ends and spermatogenesis continues, begins the stage of formation.

Distinctions

You are almost finished reading this article, try it yourself – what are the differences between spermatogenesis and oogenesis. Now check how you coped with the task.

First unlike from oogenesis spermatogenesis – it's a different time of the start of the process. In girls, the process of gametogenesis starts during fetal development - in boys of 12-14 years.

The Second – in the process of developing oocytes oogenesis and spermatogenesis-spermatozoa.

The Third difference – lifespan of germ cells. Sperm lives from one hundred to one hundred and ten days (if you consider the whole process of spermatogenesis, approximately 74 days), the female reproductive cell – is the result of a long wait in the ovary (12 to 40).

The Fourth difference – the number. Over a lifetime, men come to light and many hundreds of billions of sperm, and all stages of oogenesis are approximately 450 eggs.

Similarities

We are in the course of writing the article highlighted and similarities and differences between spermatogenesis and oogenesis. Now again generalize, denote a list of similarities of these processes.

• Three General stages (reproduction, growth, maturation).
• The Spermatocytes and oocytes are formed by mitosis.
• Growth stage in oogenesis and spermatogenesis are characterized by increasing of gametes.
• The Stage of maturation occurs by meiosis.