Download Evolution

Genetic Variation within Populations
11.1
Heritable variation.
To the extent that the variation in color and banding patterns in this
snail population is heritable, it can be acted on by natural selection.
Genetic
Variation
Why it’s beneficial:
Results in Phenotype variation which increases the
likelihood that some individuals can survive a change
in the environment.
How it’s stored in a population:
As alleles in a gene pool.
A change in a DNA sequence which
can form a new allele.
How it’s measured:
With allele frequencies; how common each
allele is in the population.
Two Main Sources
New allele combinations can form
during meiosis, when each parent’s
alleles are arranged in new ways in
the production of gametes.
Microevolution:
Observable change in allele
frequencies of a population over
time.