Gen. Improvement Quiz 4
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Created by:
iwannagraduate on February 10, 2010
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14 terms
Terms | Definitions |
|---|---|
 Systematic Processes | mutation, migration, and selection. can predict the amt of change in gene freq. and the direction of change |
| DispersiveProcess | chance, can predict amt. of change in gene freq. but NOT direction of change |
| Selection | involves differential rates, when indiv. allowed to produce more offspring than others. Most powerful force we have to change gene freq. |
| Goal of Selection | increase freq. of genes.; involves saving or culling whole animals w/ all of their genes |
| Natural Selection | occurs in nature w/o human help.; "survival of the fittest" |
| Artificial Selection | selection done by humans |
| Qualitative genes | affected by 1 to very few genes; few, distinct phenotypes; gives rise to DISCONTINUOUS VARIATION; environ. not much affect |
| Quantitative genes | controlled by many genes (POLYGENIC CONTROL-except MAJOR GENES), many phenotypes, CONTINUOUS VARIATION, affected to large degree by environ. |
| MAJOR GENE Examples | 1. Booroola Merino gene 2.postweaning wt in mice 3. Double muscling gene (myostatin mutation) 4. Callipyge gene 5. Halothange Gene 6. Dwarf Genes |
| Callipyge gene | dorset sheep; originated from ram called "solid gold", increase muscling, decr. fat, meat very tough |
| Halothane gene (stress gene) | reduced litter size, growth rate, and carcass length. increased loineye area and lean%, causes PSE |
| Two categories of Statistics | Central Tendency and variaiton (measures of) |
| Variance | average squared deviation of individual measurements from the mean; 0 to infinity |
| Parameter | characteristic of the variation |
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