Bio 1510 - 13 - Bio 1510 Basic Life Mechanisms Fall 2008...

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1 Bio – 1510 Basic Life Mechanisms Bio – 1510 Basic Life Mechanisms Fall 2008 Fall 2008 Dr. Rasheeda Zafar Chapter # 13 Chromosomes, Mapping, and the Chromosomes, Mapping, and the Meiosis-Inheritance Connection Meiosis-Inheritance Connection
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Chromosome Chromosome Theory Theory Chromosomal theory of inheritance Chromosomal theory of inheritance Proposed that genes are present on chromosomes Based on observations that homologous chromosomes pair with each other during meiosis Supporting evidence was provided by work with fruit flies Developed in 1902 by Walter Sutton 2
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Chromosome Theory Chromosome Theory 3 T.H. Morgan Experiment T.H. Morgan Experiment Isolated a mutant white-eyed Drosophila Crossed red-eyed female X white-eyed male l
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Chromosome Theory Chromosome Theory 4 Morgan crossed Morgan crossed 1 1
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Chromosome Theory Chromosome Theory 5 Testcross Testcross Parental generation female Parental generation female l
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Sex Chromosome Sex Chromosome 6 Sex determination in Drosophila Sex determination in Drosophila Based on the number of X chromosomes 2 X chromosomes = female 1 X and 1 Y chromosome = male Sex determination in humans Sex determination in humans based on the presence of a Y chromosome 2 X chromosomes = female Having a Y chromosome (XY) = male
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Sex Chromosome Sex Chromosome 7 In many organisms In many organisms the Y chromosome the Y chromosome is greatly reduced or inactive. is greatly reduced or inactive.
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Bio 1510 - 13 - Bio 1510 Basic Life Mechanisms Fall 2008...

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