October 8 - Recessive genes-if the gene is recessive the...

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October 8, 2009 Lecture 4 Sample exam question: 1. The branch of the nervous system that is responsible for increasing pulse & heart rate, and preparing us for action is the: sympathetic system 2. The brain imaging technique that reads the amount of glucose consumed by neurons & generates images of patterns of brain activities is the: PET scan Genetics Cells: 100 trillion in the human body -each cell contains a nucleus (except red blood cells) Nucleus – each contains 46 chromosomes arranged in 23 pairs (1 of each pair from each parent) Chromosome – contains numerous genes in 2 long twisted strands Genes – segments of DNA that have instructions to make proteins (the building blocks of life) - Regulate every aspect of cellular functioning Genotype – individual’s specific genetic make up present at birth & never changes Phenotype – observable characteristics produced by genes - Effected by genes & by the environment Dominant Genes – if the gene received by both parents is dominant the trait will be expressed
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Unformatted text preview: Recessive genes -if the gene is recessive, the trait will not be expressed unless the paired gene from the other parent is also recessive Eg. Brown eyes & dark hair are dominant over blue eyes & blond hair Polygenic effects – numerous genes combine to determine at trait Genetic counseling – identify whether a person has the specific gene that will result in certain diseases Eg. Huntington’s disease, breast cancer,-providing medical counseling & support Genetic engineering Recombinant DNA procedures-slice & combine DNA from 2 different organisms Eg. Production of human growth hormone Gene knockout technique-destroy certain genes to determine the effects on development & behavior BUT most behaviors effected by numerous genes Contemporary Applications Cloning:is the production of one or more individual plants or animals that are genetically identical to another plant or animal...
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