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arlik [135]
3 years ago
10

Did invaders invade china after the great wall was built

History
1 answer:
katrin2010 [14]3 years ago
8 0

The Great Wall built by Qin dynasty was built originally to defend Xiongnu. ... But because of the military geniuses Wei Qing and Huo Qubing, who win several wars against Xiongnu changed this situation, Xiongnu wasn't able to invade China any more. After the Xiongnu civil war, it was divided into two part.

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Credit: U.S. National Library of Medicine

For more information about chromosomes:

MedlinePlus Genetics provides information about each human chromosome written in lay language.From the National Institutes of Health

A basic introduction to chromosomes is available from the National Human Genome Research Institute.From the National Institutes of Health

The Centre for Genetics Education offers a fact sheet that introduces genes and chromosomes.

The University of Utah's Genetic Science Learning Center offers a description of chromosomes, including how scientists tell them apart.

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   What is a cell?

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In the nucleus of each cell, the DNA molecule is packaged into thread-like structures called chromosomes. Each chromosome is made up of DNA tightly coiled many times around proteins called histones that support its structure.

Chromosomes are not visible in the cell’s nucleus—not even under a microscope—when the cell is not dividing. However, the DNA that makes up chromosomes becomes more tightly packed during cell division and is then visible under a microscope. Most of what researchers know about chromosomes was learned by observing chromosomes during cell division.

Each chromosome has a constriction point called the centromere, which divides the chromosome into two sections, or “arms.” The short arm of the chromosome is labeled the “p arm.” The long arm of the chromosome is labeled the “q arm.” The location of the centromere on each chromosome gives the chromosome its characteristic shape, and can be used to help describe the location of specific genes.

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MedlinePlus Genetics provides information about each human chromosome written in lay language.From the National Institutes of Health

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The University of Utah's Genetic Science Learning Center offers a description of chromosomes, including how scientists tell them apart.

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