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Biology - Chromosomes and Coding Instructions
Chromosomes and Coding Instructions
How well do you know the structure of a chromosome?
Chromosomes [1] only become visible through a microscope just prior to
cell division. Before they are able to be seen, the DNA [2] has been
duplicated (replicated) and coils tightly around proteins called histones.
The two strands of DNA so formed are called chromatids [3] and are still
joined by a protein disk at a point called the centromere.
Chromosomes are distinguished by their length, shape, position of
centromere and banding. An easy way to determine the number of chromosomes
in a cell is to count the number of centromeres. The number of centromeres
will equal the number of chromosomes.
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Links:
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[1] http://alison.com/#
[2] http://alison.com/#
[3] http://alison.com/#
