A sex cell. In humans, they are sperm and eggs (ovums). - gamete, Contained inside the cell's nucleus. These are long threads of DNA, which are made up of many genes. - chromosome, A small section of DNA on a chromosome, that code for a particular sequence of amino acids, to make a specific protein. It is the unit of heredity, and may be copied and passed on to the next generation. - gene, Different versions of the same gene (not heterozygous). - allele, Always expressed, even if one copy is present. Represented by a capital letter, for example, A. - dominant allele, Only expressed if the individual has two copies and does not have the dominant allele of that gene. Represented by a lower case letter, for example, a. - recessive allele, Same two alleles for example AA - homozygous, Two different alleles for the same characteristic, for example Aa. - heterozygous, The collection of alleles that determine characteristics - genotype, Expression of the genotype. - phenotype,

4.6.1.4 Genetic inheritance terminology - term given

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