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Evolution and Genetic Influences

by: Olivia Sutton

Evolution and Genetic Influences PSYC111001

Marketplace > Boston College > Psychlogy > PSYC111001 > Evolution and Genetic Influences
Olivia Sutton
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Intro to Psychology as a Natural Science
Gene Heyman

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About this Document

Covers Darwin's Evolution Theory and the genetic influences on development
Intro to Psychology as a Natural Science
Gene Heyman
Class Notes




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This 0 page Class Notes was uploaded by Olivia Sutton on Thursday March 3, 2016. The Class Notes belongs to PSYC111001 at Boston College taught by Gene Heyman in Spring 2016. Since its upload, it has received 5 views. For similar materials see Intro to Psychology as a Natural Science in Psychlogy at Boston College.


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Date Created: 03/03/16
Lecture 3 Evolution amp Genetic In uence on Psychological Phenomena January 26 2016 Darwin s Solution Natural Selection 0 Retention phenotype traits passed on from generation to generation 0 Selection environment exert pressure that favors some phenotypic traits that result in reproductive success 0 Variation differences in phenotypic traits o Applies to all species including humans Why the Controversy Just as humannonhuman anatomy overlap humannonhuman psychology overlap 0 We aren t special just one of many theories 0 Life is a natural process no supreme being or purpose to life 0 Human capacities amp institutions rest on biological differences doesn t seem fair 0 Factors outside of our control shape us Nonintuitive o Adaptations are too complex 0 How could certain physiological things be just a natural process Ex humans being 98 related to chimp 0 Evolution by natural selection implies gradual change amp small differences between closely related species 0 How are we unique Our brain What Do You Inherit 0 DNA deoxyribonucleic acid 0 Blue print for synthesizing proteins amp other biological building blocks 0 You don t inherit traits You inherit instructions that lead to traits Gene Expression Hyper complex process that involve interactions between biological products development diet environment and experience 0 Every cell has the same DNA 0 Cells look amp function different because of gene expression 0 Proteins in cell carry out instructions and are part of cellular structure Process is like a symphony How does experience play a role in gene expression 0 Epigenetic modi cation chemical signatures are written on top of the gene without altering the genetic code Attractrepel other chemicals that help genes produce the proteins the brain amp body need to develop 0 Critical periods some genes can only be modi ed during certain periods of development Genetic Mutations Mutations can be one of two things 0 Adaptive promotes survival and spread throughout the population 0 Maladaptive does not promote survival leads to disease Ex sicklecell trait Recessive genes of maladaptive mutations in humans do not interfere with their overall health That s why it can survive in the gene pool 0 People with the sickle cell trait experience the bene t of resisting malaria Instinct Stereotypic behavioral patterns elicited by speci c stimuli amp often accompanied with speci c emotions o More complex than re exes o Assumed to be innate 0 Usually essential for survival Imprinting Filial imprinting precocial animals animals who walk after birth follow their mother eg ducklings o Occurs at birth amp dif cult to modify 0 Often determines adult mate selection 0 The Critical Period 0 Can occur within a speci c time frame 0 Animals imprint on the rst large moving object they could follow 0 Humans are more complex than animals


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