variation - the differences between individual members of the same species., Discrete - a characteristic falls into distinct groups e.g. blood type, free or attached ear lobe or the ability to roll your tongue., Continuous - a characteristic can have any values in a range e.g. height, shell diameter in snails, human hand span., gene - section of DNA that codes for a protein., Allele - different forms of a gene., Dominant - alleles always show up in the appearance (phenotype) of an organism, even if there is only one copy present. They are represented by a capital letter, Recessive - alleles only show up in the appearance (phenotype) of an organism if they are paired with another copy of that recessive allele. They are represented by a lower case version of the same letter, Phenotype - the appearance of an organism. (Example Brown eyes, black fur), Genotype - the set of genes an organism possesses, usually written as symbols. (Example: BB, Bb or bb), homozygous - the same alleles for one characteristic e.g. HH or gg., heterozygous - possess different alleles for one characteristic e.g. Hh or Gg., parents - known as the P generation, offspring - the F1 or F2 generation ,

MO4 - Variation and Inheritance

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