Controlled either by genes, environmental factors or a combination of both
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Card 9
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Have 23 single chromosomes
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Card 10
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Different forms of the same gene
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Card 11
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Two alleles the same for that particular gene
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Card 12
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Two different alleles
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Card 13
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Carries a gene which makes an embro develop into a male as it grows. This gene causes a specific protein to be produced which causes development of testes.
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Card 14
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Caused by a faulty recessive allele. Symptoms include chest infections, difficulty in breathing/digesting food.
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Card 15
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Caused by a dominant allele. Symptoms don't usually appear until after the age of 40 and include tremors, memory loss and poor concentration.
