Difference Between Gametogenesis And Embryogenesis

Difference Between Gametogenesis And Embryogenesis

What is Gametogenesis? 

The gametes are the cells that combine to form an embryo. There are two types of gametes: egg and sperm. The zygote is a cell formed by fertilizing an egg with sperm. According to the gametogenesis definition, it is the process of creating new gamete cells or eggs. So, the basic difference between gametogenesis and embryogenesis is that the latter is the process of creating new gamete cells, also known as eggs, which combine to form embryos.

Steps Involved In Gametogenesis

To differentiate between gametogenesis and embryogenesis, it is important to understand the steps involved in each. Here are the steps that gametogenesis has:

1) Gametocytogenesis: Mitosis of gametangium.

2) Gametogenesis: Miosis of primary gametocytes.

-Gametocytes are produced in a female ovary and male testes, respectively.

3) Gametogenesis II:  Miosis of secondary gametocytes.

-The ova in females and the spermatozoa in the male are produced by primary gametocytes.

4) Maturation: The process of the gametes maturing to become capable of fertilization.

-This happens in females inside their ovaries and males outside their testicles.

What is Embryogenesis?

Embryogenesis is the process of creating new embryos from those eggs. According to embryogenesis definition, it happens when an egg and a sperm combine to create an embryo. 

This word has two meanings; it can mean either the creation of embryos from those newly-created gamete cells (gametes) in females and males or the formation of an embryo itself. Typically the embryogenesis lasts up to the eighth week of pregnancy. There are four phases in embryogenesis: cleavage, gastrulation, neurulation, and organogenesis. This is one of the basic points to differentiate between gametogenesis and embryogenesis. 

Steps Involved In Embryogenesis

There are four steps in embryogenesis:

1) Cleavage

  • The nucleus divides into two parts.
  • The nucleus divides into two parts, the cytoplasm is split up, and a cell membrane forms.
  • This process occurs during the first week of embryogenesis.”
  • It’s controlled by mitosis: when one cell splits into two identical cells.

2) Gastrulation

  • Formation of three germ layers and the development of a blastula or hollow ball.
  • Cells move inward and form three layers.
  • This process occurs during the second week of embryogenesis.
  • Gastrulation is controlled by endoderm, mesoderm, and ectodermal cells in a specific order; that is why it is also known as sequential cell migration or gastric cavity formation.

3) Neurulation

  • A neural groove appears on the topmost layer, which will become the brain and spinal cord in later phases.
  • Neurulation is a process that takes place in the third week of embryogenesis.
  • The neural groove appears on the topmost layer, which will become the brain and spinal cord in later phases.
  • Neurulation is controlled by ectodermal cells. The process of neurulation starts at the dorsal lip – a point between two notochords and ends when all vertebrae have been formed from the axial mesoderm.

4) Organogenesis

  • Development of organs and tissues such as teeth, lungs, nails.
  • Organogenesis is the final step in embryogenesis.
  • It occurs during the fourth week of embryogenesis, and it’s controlled by cells that form into organs, tissues, nails, etc.
  • The process starts with the formation of a ball from which all body parts will be formed as they grow larger and more complex.
  • All these steps are interlinked and there is no point where one process starts and the other ends.

What Are The Major Differences Between Gametogenesis and Embryogenesis?

Now, let us understand the difference between Gametogenesis and Embryogenesis.

Difference Between Gametogenesis And Embryogenesis
  • Gametogenesis is the process of creating new gamete cells or eggs, while embryogenesis is the creation of new embryos from those eggs.
  • To understand the difference between gametogenesis and embryogenesis, you should know that in gametogenesis, egg and sperm are created in males and females, respectively, whereas in embryogenesis, an egg combines with a sperm to create an embryo.
  • The zygote, which is a cell formed by fertilizing an egg with sperm in the process of embryogenesis, goes on to divide and takes shape into a human being.
  • The zygote can also refer to any single cell that divides without replicating its chromosomes as it does so.”
  • Gametogenesis happens prior to fertilization, while embryogenesis happens after fertilization.
  • Gametogenesis occurs in ovaries and testes, while embryogenesis occurs in ovaries and uterus.

What Are The Similarities in Gametogenesis and Embryogenesis?

  • A zygote is a cell created by fertilizing an egg with a sperm, and the resultant embryo develops from these cells.
  • Both gametogenesis and embryogenesis can be divided into four phases: cleavage, gastrulation, neurulation, and organogenesis.”
  • When you define embryogenesis and gametogenesis, you should know that both are the process of creating an embryo or sexual reproduction in humans.

A Synopsis Of Difference Between Gametogenesis and Embryogenesis

TimelineGametogenesis happens prior to fertilization, while embryogenesis happens after fertilization.
OccurrenceGametogenesis occurs in ovaries and testes, while embryogenesis occurs in ovaries and uterus.
PhasesBoth can be divided into four phases: cleavage, gastrulation, neurulation, and organogenesis.”
WhereThe gametocytes are produced in a female ovary and male testes, respectively. Whereas in embryogenesis, an egg combines with a sperm to create an embryo.

Frequently asked questions (FAQ’s)

What is the process of gametogenesis and embryogenesis?

Gametogenesis is a biological cell division in which an organism divides into two daughter cells that are genetically identical to each other, while embryogenesis happens after fertilization. The zygote can also refer to any single cell that divides without replicating its chromosomes as it does so.

Discuss the role of gametes in gametogenesis.

Gametogenesis definition is a process of gamete maturing to become capable of fertilization. This happens in females, inside their ovaries, and males outside their testicles.

Write a short note on gastrulation.

Gastrulation is the process of the formation of three germ layers and the development of blastula or hollow balls. This process occurs during the second week.