Question

1. A change in the genetic makeup of a population due to a random event is known as:
*
20 points
Genetic Drift
Gene Flow
Natural Selection
Mutation
2. The "Great Dying" was a mass extinction event in Earth's history. What was the main reason for the major extinction of organisms?
*
20 points
Meteor strike
New disease
Toxic methane produced by bacteria
Lava flows
3. An example of geographic isolation is
*
20 points
formation of a river
formation of large valleys
drying up of a large lake
all of the above
4. Gene Flow is the exchange of genes between two populations due to
*
20 points
isolation
artificial selection
migration
extinction
5. Mutations cause
*
20 points
change in the DNA sequence
genetic variation
can be helpful or harmful
all of the above

Answer 1

Here are the answers to your questions:

1. A change in the genetic makeup of a population due to a random event is known as:
- **Genetic Drift**

2. The "Great Dying" was a mass extinction event in Earth's history. What was the main reason for the major extinction of organisms?
- **Toxic methane produced by bacteria** (this is considered a leading factor associated with the Permian-Triassic extinction event)

3. An example of geographic isolation is:
- **all of the above** (formation of a river, formation of large valleys, drying up of a large lake can all lead to geographic isolation)

4. Gene Flow is the exchange of genes between two populations due to:
- **migration**

5. Mutations cause:
- **all of the above** (change in the DNA sequence, genetic variation, can be helpful or harmful)

Feel free to ask any additional questions!