2_Inheritance

2_Inheritance - Suzanne Edmands Office hours (AHF 316): M...

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1 Suzanne Edmands Office hours (AHF 316): M 11-12, W 3-4, and by appointment You are here AH F
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2 A little about me… Research: Population and evolutionary genetics of marine organisms Teaching: Fall - BISC 120 (Evolution section) Spring - BISC 456 (Conservation Genetics) on Catalina Island!
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3 “Nothing in biology makes sense except in the light of evolution -Theodosius Dobzhansky, 1973
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4 Lecture 2: Patterns of Inheritance Chapter 14
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5 Gregor Mendel * Austrian Monk Lived 1822-1884 Developed laws of inheritance Work not appreciated until after his death * Throughout the course, important names and terms you will be underlined .
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6 Why Peas? Many distinct traits Mating can be controlled Easy to do both cross fertilization and self- fertilization Fairly short generation time Early experiments showed interesting patterns http://www2.edc. org/weblabs/IncompleteDom/incompletedominance .html Fig. 14.2
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P Generation (true-breeding parents) F 1 Generation (hybrids) F 2 Generation Purple flowers White flowers All plants had purple flowers A typical experiment with true-breeding parents Fig. 14.3
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8 Mendel’s Model 1) Trait variation is due to alternative versions (alleles ) of heritable factors (genes ) 2) For each character an organism inherits two alleles, one from each parent 3) Dominant alleles mask recessive alleles 4) Two alleles for a heritable character segregate (separate) during gamete formation and end up in different gametes ( = Law of Segregation )
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9 Inferred dominant and recessive traits for 6 other characters All showed 3:1 pattern Table 14.1
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This note was uploaded on 07/26/2009 for the course BIO 120 taught by Professor Staff during the Fall '07 term at USC.

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2_Inheritance - Suzanne Edmands Office hours (AHF 316): M...

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