Lecture 33 - BIOL104-04 Principles of Biology I November...

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Unformatted text preview: BIOL104-04 Principles of Biology I November 17, 2010 Lecture #33 Ch 13: Chromosome mapping & the Meiosis-Inheritance Connection Genetic variation Crossing over Independent assortment Separation & distribution of homologous chromosomes Fertilization Reciprocal Cross A set of two matings Mothers phenotype in the first cross is the fathers phenotype in the 2nd cross Mendel tried a reciprocal cross with pea shape Drosophila melanogaster Fruit fly Small size Easy to maintain Short reproductive cycle (10 days) Abundant offspring (few hundred/mating) Phenotypic variation among individuals Wild type Most common phenotype Mutant Different from wild type Difference is due to a mutation Wild type Mutant Reciprocal cross For Mendel & garden pea shape reciprocal crosses were same BUT for fly eye color they were not the same Red-eye female x white-eye male F1 progeny all red eyes White-eye female x red-eye male F1 progeny Females red eyes Males white eyes Discovery of sex chromosomes Observation in beetles Females had 20 large chromosomes Males had 19 large and 1 small...
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This note was uploaded on 05/03/2011 for the course BIOL 104 taught by Professor Bray-speth during the Fall '11 term at Saint Louis.

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Lecture 33 - BIOL104-04 Principles of Biology I November...

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