Genetic Variation
Genetic variation refers to the variation in the genome sequences between individual organisms of a species. Individual differences or population differences can both be referred to as genetic variations. It is primarily caused by mutation, but other factors such as genetic drift and sexual reproduction also play a major role.
Quantitative Genetics
Quantitative genetics is the part of genetics that deals with the continuous trait, where the expression of various genes influences the phenotypes. Thus genes are expressed together to produce a trait with continuous variability. This is unlike the classical traits or qualitative traits, where each trait is controlled by the expression of a single or very few genes to produce a discontinuous variation.
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Part C - Natural selection in monkey flowers
Some monkey flowers (Mimulus guttatus) living near the sites of copper mines can grow in soil containing high concentrations of copper, which is toxic to most plants.
Copper tolerance is a heritable trait.
The map below shows the area near an old copper mine, which contaminated the nearby soil with copper. A stream flows past the mine toward the lake at the bottom
right of the map.
A map of the area near an old copper mine.
Omine shaft
Key
Copper-contaminated soil
Uncontaminated sol
Sites where nearly 100% of the monkey-flower plants
are copper tolerant at 0.5 po/om
lake
O Sites where less than 20% of the monkey-flower plants
are copper tolerant
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Use the map to determine which of the statements below are true.
Select the three statements that are true.
> View Available Hint(s)
The population that existed before mining must have included both copper-tolerant and copper-intolerant plants.
OCopper contamination in the soil created copper-tolerant plants.
OCopper-tolerant plants are found only in contaminated soils.
O Nearly 100% of monkey flowers growing in copper-contaminated soil are copper tolerant.
OIf you were to test monkey flowers growing on the shore of the lake, you would expect nearly 100% of them to be copper tolerant.
O Natural selection favors copper tolerance in all soils near the old mine, not only in the contaminated soils.
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