11 BIOL 1001 Mutation Natural Selection (Jan. 30) post-lecture

Choose the most accurate answer a the bird is

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Unformatted text preview: increase exponen3ally. 1à༎ 2 à༎ 4 à༎ 8 à༎ 16 à༎ 32 à༎ 64…2n (n represents rounds of reproduc3on) 2. Popula3ons generally remain stable once reach a certain size. 113 Observa3on 3 Ecology 3. Natural resources are limited. Inference 1 ‘Struggle for existence’ In each genera3on, only a frac3on of the offspring survive. So, who ends up surviving? 114 Observa3ons 4 & 5 Heredity 4. Individuals in a popula3on vary in many characteris3cs. 5. Many characteris3cs are heritable. Inference 2 Because of their heritable traits, some individuals more likely to survive & reproduce than others without those traits (Unequal/differen3al 115 reproduc3on) Where does change occur? Natural Selec3on Generation 2 Generation 1 Gene A → colour 2 alleles → A1 and A2 A1A2 A1A2 A2A2 A1A2 A2A2 A1A1 A2A2 A1A1 A1A2 Generation 1 A1A1 117 A1A2 A2A2 A1A2 A1A2 A2A2 A1A1 A2A2 A1A1 A1A2 A1A1 Generation 1 Calculate the allele frequency of both alleles in the popula3on. A.  A1 = 0.3 ; A2 = 0.3 B.  A1 =0.3 ; A2 = 0.7 C.  A1 = 0.5 ; A2 = 0.5 D.  A1 = 0.9 ; A2 = 0.1 118 Where does change occur? Natural Selec3on Generation 2 Generation 1 Gene A → colour 2 alleles → A1 and A2 Before A1A2 During the killings… A1A2 A2A2 A2A2 A1A2 A2A2 A2A2 A1A1 A2A2 A2A2 A1A1 A1A2 Generation 1 A1A1 A1A1 Still Generation 1 119 Before A1A2 During the killings… A1A2 A2A2 A2A2 A2A2 A2A2 A2A2 A1A1 A1A2 A1A2 A1A1 A1A2 Generation 1 A1A1 A1A1 Still Generation 1 What is happening in the second picture? Choose the most accurate answer. A.  The bird is choosing those beetles with A1 alleles. B.  The bird is choosing those...
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This note was uploaded on 03/03/2013 for the course BIOL 1001 taught by Professor Dr.kelly during the Spring '13 term at York University.

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