We inherit - one set of chromsomes from each parent, Our body cells contain - 23 pairs of chromosomes, We inherit 2 versions - of each gene, Different versions of the same gene are known as - alleles, When carrying out genetic crosses we use - 1 letter, Different alleles are represented by - capital and lower cases, A dominant allele - is represented by a capital letter, a recessive trait is only expressed when - two recessive alleles are inherited, a dominant trait can be expressed when - one or two dominant alleles are inherited, Homozygous individuals have - two of the same type of allele, Heterozygous individuals have - two different alleles , Homozygous dominant can be expressed as  - BB, Homozygous recessive can be expressed as - nn, Heterozygous can be expressed as - Rr,

1 Inheritance and Variation Part 2 Alleles and Inheritance

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