What does regulative development mean?
Regulative development generally occurs in early gastrulation when cells are induced to form different structures according to the cell-cell signaling interactions in a specific area of the embryo that lead to the conditional specification of a cell’s fate.
What is mosaic and regulative development?
To oversimplify: mosaic development depends on agents, such as transcription factors, being placed locally in the egg by the mother. Regulative development depends in part on long-range gradients of positional information, such as that provided by the Hedgehog protein, that can pattern many cells at once.
What is Mosaic cleavage?
Mosaic cleavage is also known as determinate cleavage. As the name suggests the cells of the blastocyst have a pre-decided fate which means any cell of the blastocyst cannot develop into an individual animal. This type of cleavage is generally seen in the protostomes.
Do humans have radial cleavage?
Process of Radial cleavage: It can develop into any kind of tissue. In the human zygote, cleavage occurs in the fallopian tubule. In radial cleavage, the eight-celled stage has two layers of four cells, with each cell located below or above the other cell.
What is syncytial development?
Term: embryonic development via the syncytial blastoderm. Definition: The process whose specific outcome is the progression of the embryo over time, from zygote formation through syncytial blastoderm to the hatching of the first instar larva. An example of this process is found in Drosophila melanogaster.
What is mosaic egg?
The Mosaic egg is a jewelled enameled Easter egg made under the supervision of the Russian jeweller Peter Carl Fabergé in 1914. The Fabergé egg was made for Nicholas II of Russia, who presented it to his wife, the Empress Alexandra Feodorovna on Easter 1914.
What is Meroblastic cleavage?
Meroblastic cleavage takes place in those eggs where the amount of yolk is high, which leads to the partial or incomplete cleavage. It is basically of two types spherical and discoidal. The discoidal type of cleavage takes place in the reptiles and birds whose eggs are telolecithal in nature.
Are humans a Deuterostome?
Humans are deuterostomes, which means when we develop from an embryo our anus forms before any other opening.
What is the difference between spiral and radial cleavage?
In radial cleavage, the developing embryo divided right angles to the previous division, resulting in four blastomeres situated directly above four others. In spiral cleavage, the division of cells in the developing embryo occurs in a spiral manner. This is the difference between radial and spiral cleavage.
What is the syncytial theory?
The syncytial theory of neural development proposed that all the cells of an embryo are connected by fine protoplasmic threads that form the basis of the nervous system. Hensen predicted that these connections would be strengthened through the function of their targets.
What does socialism mean to you?
What does socialism mean? Socialism is an ideology or system based on the collective, public ownership and control of the resources used to make and distribute goods or provide services. This involves ownership of such things not by private individuals but by the public (the community as a whole), often in the form of a centralized government.
What is Soci-socialism?
Socialism is a political, social and economic philosophy encompassing a range of economic and social systems characterised by social ownership of the means of production and workers’ self-management of enterprises.
What are the main features of socialism?
Socialism is a system based upon de facto public or social ownership of the means of production, the abolition of a hierarchical division of labor in the enterprise, a consciously organized social division of labor. Under socialism, money, competitive pricing, and profit-loss accounting would be destroyed.
What is a socialist person called?
The noun socialist refers to someone who supports socialism. It can also be used as an adjective to describe things involving socialism or that operate under socialism, such as countries or economies. Socialism is both a social and an economic theory, with many varying interpretations as to what it truly entails.