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They depend on natural variation in traits due to mutation.
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Why does natural selection depend on variations and DNA?
The variations in the DNA are responsible in differences between desirable traits and unwanted traits. Mutations also cause changes in the DNA.
What is an important factor of natural selection?
Variations within a population
A series of helpful variations in a series results in?
natural selection
What is disputive selection?
When natural selection favors extreme variations of a trait (ex. Biggest & Smallest)
Which might a series of helpful variations in species result in?
natural selection
How does natural variation affect evolution?
Natural selection (the driving force of evolution) is the selection of genetic variations by how they effect the organism's chances of survival or reproduction. If they diminish it's chances, the organism or it's immediate offspring die and the gene is gone. If the genetic variations increase it's chances, then it survives. Without genetic variations there can be no evolution. Natural selection is the selection (by environmental pressures) of those variations.
Why are variations in a species needed for natural selection to occur?
What would be selected if organisms did not have differences that lead to better survival and reproduction, or the opposite. That is all natural selection is.
What is one factor that affects natural selection and artificial selection?
Variation in the organisms under selection. In both artificial selection and natural selection there must be heritable variations that have the possibility of being in the case of artificial selection what the selector wants in the organism and in thje case of natural selection survivability and reproductive advantages.
Does natural selection lead to helpful or harmful variations that continue through the species?
HeLpful
Is it true that through natural selection harmful variations gradually accumulate in a species?
yes
What is the starting point for all natural selection?
Mutation and recombination leading to variations in organisms. Without these variations there would be nothing to select from.
Why variations are important in human life?
Variations are the basis of evolution, but variations within a population create diversity, which is useful to slow disease and allow natural selection to occur.
