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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