gene - section of DNA that codes for a characteristic, allele - alternative form of a gene, histone - protein which DNA wraps round, chromosome - coiled DNA in the nucleus, zygote - fertilised egg, gamete - sex cell, XY - sex chromosomes in a male, XX - sex chromosomes in a female, homologous chromosomes - chromosomes that are the same size, where one has come from each parent , haploid - a cell with half the amount of genetic information e.g. a sex cell, diploid - a full set of genetic information e.g. a body cell, fertilisatio - when gametes meet,

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