B1. You and your genes

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Antigen is the male hormone.

Each of our body cells have 46 chromosomes (23 pairs)

Gene - controls a characteristic

Allelle - different form of gene

Gene - hair colour, Allele - blonde, brown, black, red etc

Gene - Eye colour, Allelle - blue, brown, green etc

Gene - Blood type, Allelle - A,B,AB,0

Some genetic diseases

Allelles can be: dominant = need one copy eg black hair or recessive = need two copies eg blonde hair

Genetic crosses (punnet squares)

Mum is a carrier of cystic fybrosis and dad has cystic fybrosis



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