Answer:
During the creation of oocyte, 3 additional haploid cells are created that will not be fertilized these cells are called Polar bodies.
Explanation:
The process of formation of oocyte is known as the Oogenesis. The oogenesis is the formation of oocyte which is capable of being fertilized, and the process begins even before the birth of the child. The oogonia is a diploid cell which undergoes mitosis to form the primary oocyte.
The primary oocyte then undergoes first meiotic division forming the secondary oocyte. this secondary oocyte is haploid in nature and this would again undergo another meiotic division to produce 4 haploid daughter cells. One of these is haploid ovum with additional 3 cells which do not get fertilized. these additional haploid daughter oocyte cells are Polar bodies.
Geographical isolation (vicariance) is the main reason for the evolution of either side mouse into new species.
What is geographical isolation?
Two populations of the same species are geographically separated by a barrier, they will eventually become genetically distinct from one another. Even when they are exposed to the same kinds of environmental selection forces and are living in the same region, two populations of the same species can yet become genetically distinct from one another.
A new river cuts through a land mass, separating populations of mice on either side. these mice then evolve into new species on the two sides of the land mass, the separation of a group of organisms by a geographic barrier, resulting in the differentiation of the original group into new varieties or species.
Hence, vicariance is a kind of evolution caused by geographical isolation.
To learn more about the geographical isolation and vicariance the link is given below:
brainly.com/question/9601840?
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Ferns are both seedless and vascular
Answer:
The lytic cycle has 6 stages: Attachment, penetration, transcription, synthesis, maturation, and lysis.
Explanation:
- Attachment: is the first step of the lytic cycle, and it consists of the attachment of the virus to the host cell, which is the cell that the virus will infect.
- Penetration: once that the virus is attached to the host cell, this penetrates the cell's membrane to introduce its DNA. When the virus DNA is inside the cell's DNA is destroyed.
- Transcription: now the virus has all the machinery to reproduce itself. In other words, the cell starts the transcription of the virus's DNA.
- Synthesis: the cell synthesizes the virus' DNA and proteins.
- Maturation: in this process, the new virus is assembled and ready to be outside the cell.
- Lysis: as the viruses are ready to infect other cells, they go out of the host cell by lysis, which is a process where the membrane is broken and the cell dies to free what is inside.
