Genetis - EvolutionbyNaturalselectionmice...

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Evolution by Natural selection -mice  Evolution by Natural selection -mice      Individuals in a population vary in many inheritable traits Individuals with traits best suited to the environment are more  likely to survive and to reproduce Environment does not cause the changes - it selects for  individuals with best fit QuickTimeª and a TIFF (Uncompressed) decompressor are needed to see this picture. Deer Mice Sand Hill Variant Agouti Gene Variant Heredity, 2006
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BASIC GENETICS How are traits passed? Character  - measurable attribute of form / function Trait  - variation of a character How are traits passed Blending inheritance  - heritable factors are  soft and  can mix Particulate inheritance  - heritable factors are  hard  and cannot mix Inheritance of Acquired Characteristics  - traits  are  changed by  the environment before being  passed on  Use or disuse (Lamarck)
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Blending  versus  particulate   models of heredity
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Mendel’s methods Hybrid cross Self- fertilization
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Hybrid Cross - cross between two dissimilar types
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705 224 Second  Generation  (F2) Self-fertilization - cross in plants in which the male and female contribution come from the same plant
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Mendel’s conclusions… Observation 1:  White trait not lost in F1  generation Observation 2: White trait not diluted (not  blended) by breeding with purple trait Conclusion 1…. inheritance must  be particulate
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This note was uploaded on 05/23/2011 for the course BIO 101 taught by Professor Lanno during the Spring '08 term at Ohio State.

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Genetis - EvolutionbyNaturalselectionmice...

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