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These are dominoes. Cut each out. They join into a circle when matched correctly. allele The process in which a male gamete and a female gamete join together heterozygous A person who carries a particular allele but it is not expressed fertilisation A feature of an organism that is passed on from one generation to another eg. hair colour, eye colour carrier The alleles are the same eg. BB or bb characteristic The sex cells of an organism homozygous Made up of DNA and contains genes gametes Pollen is transferred from the anther of one plant to the stigma of another plant. chromosome Refers to the way in which characteristics are passed on from one generation to another cross-pollination Part of a chromosome that codes for a particular characteristic such as eye colour. inheritance Complex molecules that form genes gene An allele that is always expressed if it is present DNA Cell division to produce gametes dominant allele The way in which the alleles are present eg. BB or Bb or bb meiosis A female gamete in animals genotype Cell division to produce cells with the same number of chromosomes egg Divergence in the characteristics of an organism from the species or population norm or average mitosis The homologous chromosomes of a male variation The part of the cell containing nuclear material XY The way in which the alleles are expressed eg. blue eyes or brown eyes nucleus The homologous chromosomes of a female phenotype In animals, female gametes are produced here XX The male gamete in plants ovaries Two copies of this allele must be present for it to be expressed pollen In animals, male gametes are produced here recessive allele Copying of the chromosomes testes A male gamete in animals replication The cell that forms in the process of fertilisation sperm An individual grown from a single body cell of its parent and genetically identical to it zygote The study of inheritance clone A pair of chromosomes with identical genes genetics The alleles are different homologous pair An alternative form of a gene eg. B or b