Genetic Notation notes

Genetic Notation notes - Genetic Notation There are three...

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Genetic Notation There are three kinds of notation commonly used by geneticists. These are sometimes referred to as plant notation, animal notation and bacterial notation since they were originally developed by botanists, zoologists and bacteriologists. These are not limited as their names would imply however. Early human geneticists used plant style notation as do many writers of elementary genetics texts. Current corn and tomato geneticists use animal style notation, often modified by bacteriological style. So you may see any of the styles, "regular" or modified, in any of the kingdoms. The basic rules are set out below. Plant style notation The basic concept needed here is dominance & recessiveness . (Only works well if there are only 2 alleles per gene and if one allele is expressed in the phenotype and the other isn’t works for 2 codominant alleles too!) 1. Pick a letter to designate recessive phenotype (or dominant phenotype, or kind of phenotype) 2. Let’s say you were observing purple flowers and white flowers in peas. Possible choices would be a letter that refers to white (recessive), to purple (dominant) or to color (kind of phenotype) 3. Make the recessive allele lower case and the dominant allele upper case
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This note was uploaded on 04/25/2010 for the course LIFE SCI 504675445 taught by Professor Dr.merriam during the Winter '09 term at UCLA.

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Genetic Notation notes - Genetic Notation There are three...

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