lecture notes 2 - Is there a gene for intelligence?...

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Is there a gene for intelligence? Evolution and genetics
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Which is more important- heredity or environment ? This question is meaningless, as they are both equally important. No behavior can develop in the absence of either heredity or environment.
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A more meaningful question Do the observed differences in this population depend more on differences in heredity or differences in environment?
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Inheritance occurs through genes, which come in pairs on chromosomes (which also come in pairs). When both pairs of genes are the same- they are said to be homozygous; when they differ they are said to be heterozygous.
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to have blue eyes you need to be homozygous for blue, both genes the same. Brown may be heterozygous.
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Why? because certain genes are dominant while others are recessive. Blue is a recessive gene (bb) and brown is a dominant gene (Bb, BB). Thus, if you have a brown gene and a blue gene, brown will be expressed.
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Genes and Chromosomes Genes are a portion of a chromosome, A chromosome is a molecule of deoxyribonucleic acid, DNA.
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DNA is composed of 4 bases- guanine, cytosine, adenin, and thymine. The order of these bases determines the development of your body and its daily function.
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DNA vs. RNA A strand of DNA serves as a model for the synthesis of RNA (ribonucleic acid). RNA is a single strand composed of a sequence of bases- guanine, cytosine, adenine, and uracil. Once RNA is synthesized, it is dispersed to perform a number of functions. mRNA is responsible for the formation of proteins…
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How genes affect behavior When we say a gene for brown eyes, what we mean is that we have a gene that produces a protein, which under normal conditions, pigments the eyes brown. If we speak of a gene for depression we also mean that this gene produces proteins that under certain circumstances increases the probability that depression occurs.
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Genes can directly and indirectly affect the probability of a given behavior. How? affecting the expression of chemicals that influence behavior, by failing to repair damage, by producing toxic proteins
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Most things, including eye color, are more complicated- i.e. diabetes. It appears to be controlled by at least 12
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This note was uploaded on 04/16/2008 for the course PSYCH 220 taught by Professor Shervin during the Spring '08 term at Western Washington.

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lecture notes 2 - Is there a gene for intelligence?...

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