Chromosomes

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Genes X and Y Sex Chromosom... from heftyheathen.wordpress.com
more about “Chromosomes“, posted with vodpod
Sep
2008
Chromosomes from heftyheathen.wordpress.com
more about "Chromosomes", posted with vodpod
Aug
2008

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First collected by maspron
Nov 24, 2007
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Chromosomes Chromosomes contain the genetic material deoxyribonucleic acid or DNA. In association with proteins, the twisted strands of DNA become coiled and folded to give chromosomes a beaded appearance. Each bead represents a gene-a length of DNA coding for the synthesis of one or more proteins. There are thought to be more than five hundred genes on each of the cell's forty-six chromosomes. Here a progression is shown from a chromosome, as it appears under the microscope, to the molecular architecture of DNA, shown diagrammatically to illustrate the double helix. The chromosome content of every cell in the body consists of forty-six individual chromosomes, except for the sperm and ova, which have only twenty-three. Highly magnified, this chromosome set shows the X (red) and the Y (blue) sex chromosomes. A combination of X and Y denotes male characteristics, while an XX pair results in the birth of a girl. Since sperm contain either X or the Y chromosome and the ova only the X, sex is governed by the sperm.
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