1 / 13

Genetics and Psychology

Genetics and Psychology. How much do genes decide our behavior? Pages 72-74. Genes: Our Code for life. Ms. Martin shares 98% with And 99.9% with . All cells contain DNA. Chromosomes and Genes. Each cell has 46 chromosomes = 23 pairs Genes give instructions to perform a certain function

clover
Download Presentation

Genetics and Psychology

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

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.

  5. Dominant vs Recessive genes • 2 recessive genes = recessive trait • 1 dominant + 1 recessive = dominant • 2 dominant = dominant

  6. 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

  7. 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

  8. 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

  9. 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

  10. Chromosomal Disorders • Turner’s Syndrome • Single X on 23rd pair • Shortness, webbed necks, sterility

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

  12. Geneticists can now test for some disorders in Utero • Down’s syndrome • Tay-Sachs disease (death to nerve cells mental/physical deform. onset 6mo.-death @4) • 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

More Related