XX - Sex chromosomes in a female , Gene - Small section of DNA , Double helix - Shape of DNA molecule, Alleles - Different forms of the same gene, Phenotype - Appearance or characteristic. Due to genes + the environment, Fertilisation - Fusion of gametes, Dominant allele - Controls a characteristic when only one copy is present, Recessive allele - Only controls a characteristic if there is no dominant allele, DNA fingerprinting - Used to identify individuals, XY - Sex chromosomes in a male ,

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