allele - Most genes come in different versions called alleles. So a gene for eye colour may have one version that can cause dark eyes, and another allele that can cause pale eyes., dominant - Allele that will always affect the phenotype (as opposed to a recessive allele, whose effect will not be seen if a dominant allele is present)., genetic diagram - Diagram showing how the alleles in two parents may form different combinations in the offspring when the parents reproduce., genetic variation - Also called inherited variation. Differences between organisms passed on to offspring by their parents in reproduction., genotype - The alleles for a certain characteristic that are found in an organism. Written in a shorthand using letters to represent the alleles (with the dominant allele having a capital and being written first)., heterozygous - When both the alleles for a gene are different in an organism., homozygous - When both the alleles for a gene are the same in an organism., phenotype - The characteristics that a certain set of alleles produce., recessive - Allele that will only affect the phenotype if the other allele is also recessive. It has no effect if the other allele is dominant.,

Inheritance and Variation

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