Mechanisms of Evolution

Mechanisms of Evolution

Mechanisms of evolution? What is that?

• They are what causes evolution to occur, they are what drives evolution over time!

• What are the mechanisms? What important vocabulary should I learn?

• Read the slides and answer the questions

Gene Pool

This is a collection of different gene types (alleles) found in all the individuals in a population

Population & Community

Population: A group of the same species in the same place

Community: Various species in a larger area

Multiple Choice

Which of the following represents a gene pool?

Gene Flow

Process by which genes (alleles) move from one population and are introduced into another population

Multiple Choice

There are 2 herds of Caribou in Northwestern Montana, one male Caribou strays from one herd to mate with a female in the other herd. What mechanism of evolution is this?

• Gene Flow

• Genetic Drift

• Population Drift

Genetic Drift

• When a chance event causes a gene type or allele to be less available

• Most of the green bugs are gone so there is hardly any of that gene type!

• Let's practice

Multiple Choice

In a forest a large fire broke out that destroyed much of the area. There were 2 large populations of rabbits, one with brown fur and the other with white fur. After the fire the there were hardly any of the rabbits with white fur left. What mechanism of evolution is at work here?

• Gene Flow

• Genetic drift

• Allele frequency

Multiple Choice

Which of the following would be considered founder effect?

• A female deer leaves her herd to join a separate large herd

• A few spotted rabbits leave a large population of rabbits and start a new population of their own in a different place

Multiple Choice

An area had a diverse population until an unexpected earthquake hit and most of people that survived were of American Indian descent, what would this event be called?

• Founder effect

• bottle neck effect

• Gene flow

Speciation

Click the link to watch the video:

https://youtu.be/kvT4JLdWg2c

Multiple Choice

Birds have specific bird songs and mating calls. Over time 1 species of birds splits off to become 2 distinct species and therefore no longer recognize each others mating calls. What kind of reproductive isolation is this?

• Behavioral Isolation

• Temporal Isolation

Multiple Choice

The sugar flying and the flying squirrel share a common ancestor, this is an example of?

• Convergent Evolution

• Divergent evolution

• Complete Evolution

Multiple Choice

The North Leopard Frog and the North American Bullfrog can physically mate, however they do not as the North Leapard frog only mates in April and the American Bullfrog mates in July. What is this called?

• Speciation

• Temporal isolation

• Convergence