Name:
Evolution:
Date:
MECHANISMS OF EVOLUTION and NATURAL SELECTION
1. Types of evolutionary forces
Evolutionary
mechanism
Description
1. Genetic drift
Allele
2. Gene flow
The
3. Mutation
change by chance.
of alleles from one
to another changes the
allele frequencies in each population.
4. Recombination
Occurs during meiosis which results in new combinations of
can
be favored for or against in natural selection.
that
For each scenario described below, determine if it is: a. genetic drift; b. gene flow; c. mutation, or
d. recombination.
5.The influenza virus comes in different forms. Type A influenza can have slightly different protein
structures, which may confuse
our immune systems. The slightly different proteins are produced by the
accumulation of mutations in the genes that
code for these particular proteins.
6. During an earthquake, a small group of deer are separated from their herd. A long distance away
they find a new
population of deer and begin interbreeding with the new deer.
7. During a forest fire, a population of rabbits is greatly affected and most of the population dies.
This changes
the allelic frequency of the population.
8. A random change in the sequence of genes during egg and sperm production produces
offspring that are phenotypically different than most of the population.
9. What is the
relationship among
evolutionary
mechanisms and
genetic diversity?
0. What is the relationship between evolutionary mechanisms and natural selection?
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