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Unformatted text preview: The characteristics studied by Mendel were due to single genes. On the pair of chromosomes diagrammed below, the letter "A" represents a gene for yellow seeds. The letter "a" on the homologous chromosome represents a gene for green seeds. By convention, upper case letters are used to represent dominant genes and lower case letters are used for recessive genes. Because individuals are diploid , two letters can be used to represent the genetic makeup of an individual. In the case of seed color, the following three gene combinations are possible: AA, Aa, and aa. Heterozygote (also called hybrid) refers to an individual that has two different forms of the gene. Example: Aa Homozygote refers to an individual that has two identical genes. Example: AA or aa A hybrid is a heterozygote. Example: Aa...
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- Fall '10