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Genetics

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Valentina Reichel

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What is a chromosome

A chromosome is a threadlike strand of DNA in the cell nucleus that carries the genes in a linear order. It is also known as tightly wound DNA. It is a structure that DNA wraps around.

MORE INFORMATION:

A chromosome is an organized structure of DNA and protein that is found in cells. It is a single piece of coiled DNA containing many genes, regulatory elements and other nucleotide sequences. Chromosomes also contain DNA-bound proteins, which serve to package the DNA and control its functions.

Chromosomes vary widely between different organisms. The DNA molecule may be circular or linear, and can be composed of 10,000 to 1,000,000,000 nucleotides in a long chain.

Cells may contain more than one type of chromosome; for example, mitochondria in most eukaryotes and chloroplasts in plants have their own small chromosomes.

Chromosomes are the essential unit for cellular division and must be replicated, divided, and passed successfully to their daughter cells so as to ensure the genetic diversity and survival of their progeny.

Chromosomal recombination plays a vital role in genetic diversity. If these structures are manipulated incorrectly, through processes known as chromosomal instability and translocation, the cell may undergo mitotic catastrophe and die, or it may aberrantly evade apoptosis leading to the progression of cancer.

In practice "chromosome" is a rather loosely defined term. In prokaryotes and viruses, the term genophore is more appropriate when no chromatin is present. However, a large body of work uses the term chromosome regardless of chromatin content. The simplest genophores are found in viruses: these DNA or RNA molecules are short linear or circular genophores that often lack structural proteins.

Chromosomal DNA encodes most or all of an organism's genetic information; some species also contain plasmids or other extrachromosomal genetic elements.
Structure in nucleus made of DNA and protein. Sections of a chromosomes are genes.
structure in a cell's nucleuse thaat contians genetic material
A chromeosome is organized structure of DNA and protein that is found in cells.
coiled strands of genetic material
coiled strands of genetic material

What happens during telophase

During telophase the cell membrane gets "pinched" and the orgenelles and DNA are split. following telophase is cytokinesis when the cell membrane is sealed off and the mother cell becomes two sister cells.

The final stage of meiosis or mitosis, in which the separated chromosomes reach the opposite poles of the dividing cell and the nuclei of the daughter cells form around the two sets of chromosomes.

This answer contributed by The Scientific Theory Academy of Science (STAOS)

In telophase nuclear membrane is begin to reform at both ends of the cell and spindle fibers disappear. chromosomes uncoil and return to chromatin form in preparation for Interphase. Cytokinesis coincides with this stage of mitosis.

All of this is true but a much easier answer to this question is that telophase is when a new nucleus forms around each copy of dna.

When is cytokinesis complete

It is complete when two daughter cells are produced. Cytokinesis is the process in which the cytoplasm of a single cell divides to form two daughter cells.

Which phase occurs directly after G2

M Phase

Genetic disorders can result when chromatids fail to separate properly. During with phase is this problem most likely to occur

Anaphase

Why are karyotypes prepared using cells in mitosis rather than cells in interphase explain.

in mitosis (specifically Prophase) the chromosomes are dense and therefore visible for a karyotype. during interphase they do not have to be ready to be pulled apart so they are not wound tightly.

Which group migrated north largely to New York City where they formed a unique immigrant community

puerto ricans

What was Towns of shacks and tents built by homeless people during the Depression were called

Hoovervilles-apex

How did Avery help build our understanding of genetics

He showed that DNA is a Transforming factor.

What statement is true of the X chromosomes

Women have two of them.

After Pearl Harbor Japan went on to capture who

Wake Island, Hong Kong, the Philippines

How are meiosis and mitosis different

mitosis only has to do with celluar reproduction

meiosis has to do with sex cells reproducing
Mitosis creates new cells that are used for development, repair, asexual reproduction and growth. Meiosis creates cells in order for organisms to reproduce sexually.

The purpose of the UNIA was to

Promote African American pride

What plays a role in cell division

Nuclear division plays a role in cell division.

Which statement about representation in the media is true

All of the above-apex

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