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Chapter 3

chapter 3 textbook notes


Department
Psychology
Course Code
PSY100H1
Professor
Michael Inzlicht
Chapter
3

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Chapter 3
1. genome: provide detailed instructions for everthing 
genome provides the option, and the environment determines which option
is taken
2. chromosomes: structure made up of genes
genes are components of DNA
DNA constists of two intertwined strands of molecules of sugar, phosphate
and nitrogen
Gene expression: Gene DNA segment DNA production of RNA 
protein
3. Human Genome Project: identify the precise order of molecules that
makes up each gene
only around 3000 genes in human body not a lot; but subtlety
4. alleles  : two versions of a gene
dominant genes
recessive genes
5. genotype: the genetic constitution of an organism; actual genetic makeup
phenotype: observable physical characteristics of an organism that result from both
genetic and environmental influences
6. reproductive cells from each parent divide to produce gametes  (contains one half
of each pair of chromosomes)
sperm and egg cells combine during fertilization
zygote  contains 23 pairs of chromosomes: one half from mother and the other
half from father
7. most mutations are benign and have little influence
8. most dominant gene disorders are lethal for most of their carriers and do not last in
the gene pool
9. monozygotic twins: exactly identical twins; one zygote divides to two
dizygotic twins: two separately fertilized eggs
10. neuron: the basic unit of the nervous system; operate through electrical impulses;
communicate through chemical signals; reception, conduction and transmission
11. dendrite: branchlike extensions of neurons that detect information from other
neurons
cell body: the place where information from thousands of other neurons is collected
and processed
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