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What's the difference? CHROMOSOMES AND GENES.


Chromosome Every cell in our body has 23 pairs of chromosomes in its central part, the nucleus, one of each pair from either parent.

These thread-like structures consist of 22 general pairs, plus a pair of sex chromosomes which can be X or Y. If there are two Xs, one from each parent, you're female and if there are an X and a Y, you're male.

Certain genetic conditions stem from chromosomal abnormalities such as Down's syndrome where chromosome 21 has three instead of the usual pair chromosomes.

Gene These are contained within chromosomes in a spiral formation - the double helix - half from the baby's mother, via the egg, and half from her father, via the sperm. Each egg and sperm contains a different mix of the parents' genes so each child is different.

Some genes are 'dominant' like the gene for brown eyes. So a child with one brown-eyed and one blueeyed parent will have brown eyes because that gene prevails. Over a lifetime genes can mutate causing diseases such as cancer.

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Title Annotation:Features; Opinion Column
Publication:The Mirror (London, England)
Date:Sep 20, 2016
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