XX, Sex chromosomes in a female , Gene, Small section of DNA that codes for a specific protein, 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 , Controls a characteristic when only one copy is present, Recessive , Only controls a characteristic if there is no dominant allele, XY, Sex chromosomes in a male , Genotype, An organism's specific genetic makeup, the unique combination of alleles (gene variants) it carries.

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