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Cleavage in Human Zygote
Cleavage is the first step in cell division and occurs in the zygote, the fertilized egg. The zygote divides into two cells and then four cells and so on. The cells become smaller and more specialized as they divide. Cleavage – Embryo | In Human Zygote Types and Characteristics.
Cleavage of Fertilized Egg
Cleavage is the first process of embryonic development. It occurs when the fertilized egg divides into smaller and smaller cells. The process is divided into two parts: mitotic cleavage and cellular cleavage.
Mitotic cleavage is when the cells divide by mitosis. The cells become smaller and smaller, and eventually form a ball of cells called a blastula. Cellular cleavage is when the cells divide by cytoplasmic division. The cells become smaller and smaller, and eventually form a hollow ball of cells called a blastocyst.
Significance of the Cleavage of the Prenatal Chorion
The prenatal chorion is a membrane that separates the embryo from the amniotic sac. The chorion is responsible for the exchange of nutrients and waste between the embryo and the amniotic sac. The chorion is also responsible for the production of the amniotic sac fluid. The chorion is cleaved when the embryo implants in the uterine wall.
Factors That Cleavage Of An Embryo Depend On:
The factors that cleavage of an embryo depend on are the size and shape of the embryo, the concentration and type of the enzyme, the pH of the medium, and the presence of inhibitors.
Blastomeres
Blastomeres are the cells that make up the early embryo. The cells are small and round and they divide rapidly to form the early embryo.
Characteristics of Blastomeres
Blastomeres are the cells that make up the early embryo. They are small and round, and have a high mitotic rate. They are able to divide and multiply quickly, and are able to differentiate into all of the different cell types that make up the embryo. Blastomeres are important for early embryonic development, and are responsible for the formation of the embryo.
Where Does Early Cleavage Take Place?
The early cleavage of the zygote takes place in the fallopian tubes. The blastocyst implants in the uterine wall a few days after fertilization. The cells of the blastocyst start to divide, and the inner cell mass becomes the embryo. The outer cells become the placenta.
Characteristics of Cleavage
Cleavage is a type of fracture where a mineral breaks along flat surfaces. This type of fracture is caused by the stress of the mineral being pulled in different directions.
Cleavage is exhibited by minerals that have a crystalline structure. These minerals have a specific arrangement of atoms that repeats in a regular pattern. The flat surfaces that are created when the mineral fractures follow the planes of these atoms.
Cleavage is usually most pronounced in minerals that have a low hardness. This is because these minerals are less resistant to fracturing.
Some minerals do not exhibit cleavage. These minerals are usually more brittle and tend to fracture into irregular shapes.
Types of Cleavage
There are three main types of cleavage: linear, radial, and bilateral.
Linear cleavage results in a long, thin spindle shape. This type of cleavage is found in cells that divide rapidly and evenly, such as embryonic stem cells.
Radial cleavage results in a circular shape. This type of cleavage is found in cells that divide slowly and unevenly, such as liver cells.
Bilateral cleavage results in a two-sided shape. This type of cleavage is found in cells that divide quickly and evenly, such as white blood cells.
Cleavage in Chick Embryo
The cleavage of the fertilized egg into a multicellular embryo is a process that occurs in all animals. In chick embryos, the first cleavage furrow appears on the surface of the egg about 18 hours after fertilization. The furrow divides the egg into two cells, and each cell then divides again. This process of cell division continues, and the embryo gradually becomes a ball of cells.
Cleavage – Embryo | In Human Zygote Types and Characteristics.
