MCDB Christoffersen Lecture #3

MCDB Christoffersen Lecture #3 - MCDB Christoffersen...

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MCDB Christoffersen Lecture #3 Review of Mendel’s laws 1 st – Law of Segregation o A gene can exist in more than one form. o Organisms inherit two alleles for each trait. o When gametes are produced (by meiosis), allele pairs separate leaving each cell with a single allele for each trait. o When the two alleles of a pair are different, one is dominant and the other is recessive. 2 nd – Law of Independent Assortment o Mendel formulated this principle after performing dihybrid crosses between plants that differed in two traits, such as seed color and pod color. o After these plants were allowed to self-pollinate, he noticed that the same ratio of 9:3:3:1 appeared among the offspring. o Mendel concluded that traits are transmitted to offspring independently. Human Genetic Analysis Pedigree Analysis – deduce inheritance pattern by observing traits in already existing families.
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This note was uploaded on 01/19/2012 for the course MCDB 1a taught by Professor Feinstein during the Fall '08 term at UCSB.

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MCDB Christoffersen Lecture #3 - MCDB Christoffersen...

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