Handout02Mendel - BIS101-001/Engebrecht Spring 2010...

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BIS101-001/Engebrecht Spring 2010 Handout02Mendel The Foundation of Genetics by Mendel Mendel’s experiments culminated in five conclusions to explain heredity. These conclusions are still valid today, but they were extended by the work on genetic linkage and gene interaction. 1. Hereditary factors (or characters) are particulate in nature. The Mendelian characters are now called genes. 2. Each adult has two characters. Adults carry two alleles of each gene. Alleles are different forms of the same gene. A wild-type allele is the most common form of a gene in a natural or laboratory population. A mutant allele is a change in the DNA sequence from the wild-type allele. A mutant allele that does not cause a phenotype is called a polymorphism. 3. The two characters segregate equally from each other during gamete formation (meiosis). The two alleles segregate in meiosis to produce one half of the gametes with one allele and one half with the other allele. 4. Gametes unite at random.
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This note was uploaded on 07/02/2010 for the course BIS 101 taught by Professor Simonchan during the Spring '08 term at UC Davis.

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