Coloured LM of chromosomes of normal human female

Coloured LM of chromosomes of normal human female

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Credit: BIOPHOTO ASSOCIATES/SCIENCE PHOTO LIBRARY

Caption: Female chromosomes. Coloured light micrograph of 46 chromosomes from a normal human female. This constitutes the full karyotype, that is the total number of chromosomes found in each cell of the female human body. Each cell contains 22 matched pairs of chromosomes, and one sex-determining pair. Female and male sets of chromosomes differ only in the pair of sex chromosomes (at bottom right). A female is labelled XX, and a male XY. A normal female karyotype is written: 46,XX. The chromosomes are made up mainly of DNA, some proteins (principally histones), and small amounts of RNA. Chromosomes carry genes that determine the characteristics of an individual.

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Keywords: anatomy, chromosome, chromosomes, dna, double helix, female, female chromosomes, genes, genetics, human, human body, karyotype, light micrograph, normal

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