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2694581
chromosomes, genes and Dna
Description
Mind Map on chromosomes, genes and Dna, created by isobellehardy on 10/05/2015.
Mind Map by
isobellehardy
, updated more than 1 year ago
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Created by
isobellehardy
almost 9 years ago
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Resource summary
chromosomes, genes and Dna
THE NUCLEUS OF THE CELL CONTAINS THE CHROMOSOMES.
THE GENES ARE LOCATED ON THE CHROMOSOMES
a GENE IS A SECTION OF A DNA MOLECULE THAT CONTROLS THE DEVELOPMENT OF CERTAIN CHARACTERISTICS
Genes exist in alternative forms called alleles, which give rise to differences in the inherited characteristics
In human cells the diploid number of cells is 46 and the haploid number is 23
The sex of the person is controlled by one pair of sex hromosomes, XX in females and Xy in males
Mutation is a rare random change in the genetic material that can be inheried
many mutations are harmful, but many are also neutral and a few are beneficial
the incidence of mutations can be increased by exposure to ionising radiation or chemical mutagens
chromosomes and genes
contained in the nucleus of the cell
made up of Dna
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