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Genetics and Psychology How much do genes decide our behavior? Pages 72-74.

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Presentation on theme: "Genetics and Psychology How much do genes decide our behavior? Pages 72-74."— Presentation transcript:

1 Genetics and Psychology How much do genes decide our behavior? Pages 72-74

2 Genes: Our Code for life  Ms. Martin shares  98% with  And 99.9% with

3 All cells contain DNA

4 Chromosomes and Genes  Each cell has 46 chromosomes = 23 pairs  Genes give instructions to perform a certain function  Two of this set are X and Y (the sex chromosomes) and the other 22 pairs guide the expression of other traits.

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6 Dominant vs Recessive genes  2 recessive genes = recessive trait  1 dominant + 1 recessive = dominant  2 dominant = dominant

7 Behavior Geneticists  Ask questions about the extent that genetics plays on our differences  Heritability – statistical estimate of how much behavior is due to genes. Max value is 1.0

8 Twin Studies  Identical Twins- develop from a single fertilized egg that splits in two, creating two genetically identical organisms  Fraternal Twins - develop from separate eggs  genetically no closer than brothers and sisters, but they share the fetal environment

9 Twins and heritability studies  Bouchard – studied 100 twins raised apart and their IQ scores  Those raised apart = coefficient of.69 on IQ test  Those raised together =.88  Criticized = adopted parents have particular environment

10 Molecular Genetics  Looks at genes that can specifically cause disorders  Gender determined by 23rd chromosome pair  Men = XY – means some recessive characteristics from mother not blocked (color blindness)  Women = XX

11 Chromosomal Disorders  Turner’s Syndrome  Single X on 23 rd pair  Shortness, webbed necks, sterility

12 Chromosomal Disorders  Klinefelter’s syndrome – XXY pattern  Males – less testosterone, weaker body, possible infertility  Down’s Syndrome  Extra chromosome on the 21 st pair

13  Geneticists can now test for some disorders in Utero  Down’s syndrome  Tay-Sachs disease (death to nerve cells mental/physical deform. onset  Spina Bifida (one of most common in U.S. 1/1000 births – spinal)  Looking for an increase in a protein or hormone in early pregnancy


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