Genetics 10/4/2012 10:21:00 AM
Dominant Recessive Traits
Next Time: Heritability
Alzheimer’s—might be as a result of genetics, but don’t know how genetic
errors caused it.
Accumulation of plaques in the brain.
Genetic influence on behavior: identical twins are genetically identical, they
have the same traits, probably have the same disorders. However, there are
environmental triggers as well
how do genes “work”?
what is the outcome with recessive genes?
how is more complex behavior coded?
FROM CHAPTER 3: We would expect a 1 year old child to recover from
traumatic brain damage more quickly than an adult. Why?
a. young children have strong immune system
b. young children have more synapses
c. young have smaller brains
d. adults engage in riskier behavior
e. adults are less lateralized
Genetics of Behavior
Nature (something we’re born with) vs. Nurture (something we
learn). Both of them interact to make human being-both very
Strand-like molecules of DNA linked on chromosomes
karyotype: genetic blueprint
o Humans: 23 pairs: 22 Autosomes + sex chromosomes:
o Genes (strings of DNA molecule) provides template for RNA
codes for protein molecules (sequence of amino acids)-do
everything, influence a human being.
o the influence of genes is through protein synthesis...there are
no genes “for” a particular attribute
o gene "for" intelligence?
o So why not just Nature?
o environmental can influence protein synthesis as well
o genes determine range of possibilities, but NOT degree of
o Environmental exposure at specific interval is critical
o e.g. white-crowned sparrow must hear adul