Complete the T-chart by categorizing each environmental factor as something that would most likely increase or decrease genetic variation. Some answers will fit in both columns depending on the situation. Predator-prey relationships Competition Toxins New habitat Disasters Increased food source
Competition
Toxins
New habitat
Disasters
Increased food source
Read each example and identify it with one of the mechanisms that influence gene pools. A zebra migrates to join a different herd of zebras. Competition for sunlight leads to taller trees. The DNA of a snake changes to make its venom stronger. A grassfire randomly sweeps through a population of buffalo and kills most of the animals.
Read each example and decide what the resulting effect on the gene pool of that population would be. A zebra migrates to join a different herd of zebras. Competition for sunlight leads to taller trees. The DNA of a snake changes to make its venom stronger. A grassfire randomly sweeps through a population of buffalo and kills most of the animals.
A zebra migrates to join a different herd of zebras.
Complete the T-chart by categorizing each statement as something that would most likely be relevant to gene flow or genetic drift. Some answers will fit in both columns depending on the situation. is random is a mechanism for evolution is often related to disasters is also called “migration” deals with movement between populations
Describe an environmental factor that could influence natural selection and decrease genetic diversity. Pick a specific example to illustrate your point.
A pesticide can decrease genetic diversity in an insect population. The pesticide kills susceptible insects, while resistant insects survive and reproduce. Natural selection therefore favors pesticide resistance, reducing the variety of traits in the population.
Competition for sunlight leads to taller trees.
Competition for sunlight leads to taller trees.
Competition for sunlight leads to taller trees.
is a mechanism for evolution
Which of the following did you include in your response?
The DNA of a snake changes to make its venom stronger.
The DNA of a snake changes to make its venom stronger.
The DNA of a snake changes to make its venom stronger.
is often related to disasters
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