Anonymous
Jan 6
Patterns of cleavage? And fate map in frog? And fate map in chick?
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Jan 6
Patterns of cleavage refer to the way in which a fertilized egg undergoes cell division during early embryonic development. Cleavage patterns can vary among different organisms and can be classified into different types based on the orientation and plane of cell division.
In frogs, the cleavage pattern is known as holoblastic cleavage, which means that the entire egg is divided into smaller cells. The cleavage is radial, meaning that the cell divisions occur in a radial pattern around the animal pole of the egg. The first division is meridional, dividing the egg into two equal-sized cells. The second division is also meridional, resulting in four equal-sized cells. Subsequent divisions are equatorial, resulting in the formation of a blastula, which is a hollow ball of cells.
The fate map in a frog shows the future fate or destiny of different regions of the embryo. It is a diagram that illustrates which parts of the embryo will give rise to specific tissues and organs. In frogs, the fate map is typically represented by a series of colored lines or regions on the surface of the embryo, indicating the different germ layers (ectoderm, mesoderm, and endoderm) and their derivatives.
Similarly, in chicks, the cleavage pattern is also holoblastic, but it is discoidal rather than radial. The cleavage occurs only in a small disc of cytoplasm at the animal pole of the egg, while the yolk remains relatively undivided. The first division is meridional, dividing the egg into two unequal-sized cells: a smaller animal pole cell and a larger vegetal pole cell. Subsequent divisions are also meridional, resulting in the formation of a blastodisc, which is a disc-shaped cluster of cells on top of the yolk.
The fate map in a chick shows the future fate of different regions of the embryo, similar to the frog fate map. It is typically represented by a series of colored lines or regions on the surface of the embryo, indicating the different germ layers and their derivatives. The chick fate map is important for understanding the development of various tissues and organs in the chick embryo.
In frogs, the cleavage pattern is known as holoblastic cleavage, which means that the entire egg is divided into smaller cells. The cleavage is radial, meaning that the cell divisions occur in a radial pattern around the animal pole of the egg. The first division is meridional, dividing the egg into two equal-sized cells. The second division is also meridional, resulting in four equal-sized cells. Subsequent divisions are equatorial, resulting in the formation of a blastula, which is a hollow ball of cells.
The fate map in a frog shows the future fate or destiny of different regions of the embryo. It is a diagram that illustrates which parts of the embryo will give rise to specific tissues and organs. In frogs, the fate map is typically represented by a series of colored lines or regions on the surface of the embryo, indicating the different germ layers (ectoderm, mesoderm, and endoderm) and their derivatives.
Similarly, in chicks, the cleavage pattern is also holoblastic, but it is discoidal rather than radial. The cleavage occurs only in a small disc of cytoplasm at the animal pole of the egg, while the yolk remains relatively undivided. The first division is meridional, dividing the egg into two unequal-sized cells: a smaller animal pole cell and a larger vegetal pole cell. Subsequent divisions are also meridional, resulting in the formation of a blastodisc, which is a disc-shaped cluster of cells on top of the yolk.
The fate map in a chick shows the future fate of different regions of the embryo, similar to the frog fate map. It is typically represented by a series of colored lines or regions on the surface of the embryo, indicating the different germ layers and their derivatives. The chick fate map is important for understanding the development of various tissues and organs in the chick embryo.
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