PS3 ans

PS3 ans - Chheavhong Chheung Friday 12-12:50 Anthropology 005 Introduction to Physical Anthropology Problem Set 3(Molecular Genetics Heritability 1

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Chheavhong Chheung Friday 12-12:50 Anthropology 005 Introduction to Physical Anthropology 1. Let’s think about the evolutionary process in genetic terms. Remember that the prerequisites for natural selection are: (1) heritable (2) variation that (3) affects reproduction. A. Alleles are the variants that natural selection is ultimately choosing among; how do these variants differ at the molecular level? Variants differ in the DNA sequence. The alleles form many different types of genotype that produces each  individual organism.  Different base pairs, ACTG different nucleotides, B. How is it that these variants are transmitted to offspring? These variants are transmitted through reproduction, through the process of meiosis. Parents will pass on their  traits to their offspring.  Complimentary strands ensure the process go smoothly C. What effect does recombination have on this variation? Recombination is the process by which the alleles combine to create variations in genotypes. They determine the  type of phenotype that will be expressed.  Shuffling the alleles to create different genotype D. How do these variants arise in the first place? These variants arise through mutations in the genes.  Genetic mutation. Different kinds of mutations: substitution, insertion, deletion, frameshift, and chromosomal  inversion E. So, when selection is favoring allele C over allele D, what is happening? In other words, describe the process that is causing C to increase in frequency in the population. In this case, C must be the dominant allele because selection favors the stronger and more beneficial allele; thus 
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This note was uploaded on 12/04/2011 for the course ANTH 5 taught by Professor Gaulin during the Spring '07 term at UCSB.

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PS3 ans - Chheavhong Chheung Friday 12-12:50 Anthropology 005 Introduction to Physical Anthropology Problem Set 3(Molecular Genetics Heritability 1

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