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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