What is a determinate cleavage?

determinate cleavage in American English cell division in a fertilized or unfertilized egg resulting in daughter cells that are no longer able to produce a complete embryo by themselves.

1. What is determinate cleavage with example?
2. What is meant by determinate and indeterminate cleavage?
3. What is a cleavage definition?
4. What are the conditions that determine types of cleavage?
5. What is morula in embryology?
6. What is the difference between a morula and a blastocyst?
7. What is radial and indeterminate cleavage?
8. Why is cleavage indeterminate?
9. What is Meroblastic in botany?
10. What is cleavage Class 12 bio?
11. How would a developing mammalian embryo get its nourishment?
12. What happens to the embryo during cleavage?
13. What is the difference between a morula and a blastula?
14. How does a zygote turn into a morula?
15. What is a compacting morula?

What is determinate cleavage with example?

Determinate: the developmental fate of each embryonic cell is established very early. ... This is because the fate of each blastomere is predetermined in the early embryonic stage itself. Annelids, mollusks and ascidians which produce mosaic type of eggs exhibit determinate cleavage.

What is meant by determinate and indeterminate cleavage?

with the cell fate of each blastomere determined as early as the 2- or 4-cell stage (determinate cleavage). In deuterostomes, cell fates are not determined until quite late in development (indeterminate cleavage).

What is a cleavage definition?

Definition of cleavage

1a : the quality of a crystallized substance or rock of splitting along definite planes also : the occurrence of such splitting. b : a fragment (as of a diamond) obtained by splitting. 2 : the action of cleaving or splitting : the state of being cleft.

What are the conditions that determine types of cleavage?

The pattern of embryonic cleavage particular to a species is determined by two major parameters: the amount and distribution of yolk protein within the cytoplasm, and factors in the egg cytoplasm that influence the angle of the mitotic spindle and the timing of its formation.

What is morula in embryology?

morula, solid mass of blastomeres resulting from a number of cleavages of a zygote, or fertilized egg. Its name derives from its resemblance to a mulberry (Latin: morum). ... Those blastomeres on the surface of the morula give rise to extra-embryonic parts of the embryo.

What is the difference between a morula and a blastocyst?

A morula is distinct from a blastocyst in that a morula (3–4 days after fertilization) is a mass of 16 totipotent cells in a spherical shape whereas a blastocyst (4–5 days after fertilization) has a cavity inside the zona pellucida along with an inner cell mass.

What is radial and indeterminate cleavage?

Radial cleavage: The 8-celled stage has 2 tiers of 4 cells each, with each cell directly below or above another. Indeterminate cleavage: Cells separated in early embryonic stages can develop into an entire embryo. Deuterostome condition: The embryo's blastopore becomes the posterior (tail) end.

Why is cleavage indeterminate?

An embryonic cleavage is said to be indeterminate when it produces cells with a complete set of undisturbed animal or vegetal cytoarchitectural features and when isolated can individually develop into a whole organism.

What is Meroblastic in botany?

Definition. (embryology) The incomplete cleavage in telolecithal or megalecithal eggs of animals, such as birds and reptiles. Supplement. Depending mostly on the amount of yolk in the egg, cleavage can be holoblastic (complete or total) or meroblastic (partial).

What is cleavage Class 12 bio?

Definition : The term cleavage refers to a series of rapid mitotic division of the zygote following fertilization, forming a many celled blastula. The cleavage follows fertilization and ends with the formation of a characteristic development stage called blastula.

How would a developing mammalian embryo get its nourishment?

The mammalian embryo obtains nutrients directly from its mother and does not rely on stored yolk. This adaptation has entailed a dramatic restructuring of the maternal anatomy (such as expansion of the oviduct to form the uterus) as well as the development of a fetal organ capable of absorbing maternal nutrients.

What happens to the embryo during cleavage?

During cleavage, the cells divide without an increase in mass; that is, one large single-celled zygote divides into multiple smaller cells. Each cell within the blastula is called a blastomere. Figure 1 (a) During cleavage, the zygote rapidly divides into multiple cells without increasing in size.

What is the difference between a morula and a blastula?

Morula is 8-16 cell stage, solid mass of cells, whereas blastula is a 100 cell stage of the early embryonic development. Blastula is a hollow sphere surrounded by blastomeres.

How does a zygote turn into a morula?

Following fertilization a series of rapid cell divisions occur that decrease the cells' size with each subsequent division—this eventually produces a morula. The different cells derived from cleavage, up to the blastula stage, are called blastomeres.

What is a compacting morula?

A: A morula is the stage of development before a blastocyst is formed. The cells on day 3 are separate and round and on day 4 they start to squeeze together (compaction) so that the edges of the cells are not clear. This is the morula stage.