ARCH 131 Lecture Notes - Nitrogenous Base, Oogenesis, Transfer Rna
28 Jan 2013
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Gregor mendel (1822-1884): 1850s research on plant hybridization. Mendel"s pea plant traits (had 7 characteristics): he crossed pea plants that contrasted each other. What mendel saw: generation 1 (parents): s+w offspring: (generation 2) offspring: (generation 3) Generation 2: s + s s s s w s s s s offspring: offspring: He determined that smoothness dominated wrinkled 25% will not inherit the dominant trait. Each parent contains both a dominant and recessive particle for the trait in question. They randomly pass on one or the other to each offspring. Each parent"s contribution has a 50:50 chance which particle will be passed on, which means four possible combinations: Sw +sw = ss or sw or ws or ww. Today we refer to the particles for each trait as alleles. An allele is an alternate form of a specific gene. Homezygous dominant: having two of the dominant form of an allele. Heterozygous: having one dominant and one recessive form.
