Gamete - Sex cell used for reproduction, e.g. egg or sperm cell, Chromosome - Thread-like structures holding genes., Gene - A small packet of information controlling a characteristic., Allele - the different versions of the gene e.g. T or t, Dominant - the allele that only needs one present to be seen e.g. T - tall, Recessive - the allele that needs two present to be seen e.g. tt - short, Homozygous - when the alleles are the same e.g tt or TT, Heterozygous - when the alleles are different e.g. Tt, Genotype - the alleles you have e.g. Tt, TT or tt, Phenotype - the trait you physically see e.g. Tall or short,

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