Artificial selection.
directional selection
directional selection
VARIATION
the variation of shoe size is natural
Yes, because the two extremes of the phenotype distribution are selected against. Consider human height as an example of this type of selection and think of a normally distributed Bell curve.
This type of selection is called artificial selection.
Natural Selection.
Go to the Select menu, then select Save Selection. Then type in a name for the selection and click OK.
Breeding.
directional selection
Sexual selection is a type of natural selection resulting from variation in the ability to obtain mates.
go to movies.com and type in your movie and then select a sene
Selective breeding, which is a form of artificial selection.
its the enviorment
There are infinitely many types of variation.
directional selection
If there were no differences in an organisms ability to survive and reproduce what would there be to select from? Variation in populations is key to the naturally selective process and these variations that are reproductively successful are passed on to progeny which leads to the change in populations over time called evolution.