Genetis - Evolution by Natural selection -mice Individuals...

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1 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 Deer Mice Sand Hill Variant Agouti Gene Variant Heredity, 2006 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) Blending versus particulate models of heredity Mendel’s methods Hybrid cross Self- fertilization
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2 Hybrid Cross - cross between two dissimilar types 705 224 Second Generation (F2) Self-fertilization - cross in plants in which the male and female contribution come from the same plant Mendel’s conclusions… Observation 1: White trait not lost in F1 generation Observation 2: White trait not
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Genetis - Evolution by Natural selection -mice Individuals...

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