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Gene flow occurs when new genes are brought into a population. This occurs when organisms from one population reproduce with organism from a different population.
When populations are isolated (all by themselves), gene flow does not occur because no new genes come from outside organisms.
In the picture above, two populations of beetles move to the same area and begin to reproduce with each other. Is there gene flow?
Gene flow occurs when new genes are brought into a population. This occurs when organisms from one population reproduce with organism from a different population.
When populations are isolated (all by themselves), gene flow does not occur because no new genes come from outside organisms.
Two populations of beetles are separated by a barrier and cannot reach one another. Is there gene flow?
Which Population has the most variation?
Which populations would do well with the predator?
Lets, say spring comes and green grass begins to grow. Which population will do well with the predator?
Which populations did the best overall?
Gene flow occurs when new genes are brought into a population. This occurs when organisms from one population reproduce with organism from a different population.
When populations are isolated (all by themselves), gene flow does not occur because no new genes come from outside organisms.
A population of blue chested birds lives on one side of a river and a population of red chested birds lives on the other side. Over time, some of the blue chested birds fly across the river and begin to reproduce with the red chested birds.
Is this genetic drift or gene flow?
Does gene flow increase of decrease genetic variation?
Is this good or bad for the organism?
A person steps on a population of beetles at random?
Is this genetic drift or gene flow?
A person steps on a population of beetles at random?
What does this do to the level of diversity in the population?
Gene flow occurs when new genes are brought into a population. This occurs when organisms from one population reproduce with organism from a different population.
When populations are isolated (all by themselves), gene flow does not occur because no new genes come from outside organisms.
There are two population of butterflies: orange and yellow. Some of the yellow butterflies migrate to the area where the orange butterflies live and begin to mate with them. Is there gene flow?
Is this genetic drift or gene flow?
Does this increase of decrease genetic variation?
Is this good or bad for the organism?
A forest fire ignites in the Sam Houston State Forest and kills many members of a population of pigmy rattlesnakes.
Is this gene flow or genetic drift?
A forest fire ignites in the Sam Houston State Forest and kills many members of a population of pigmy rattlesnakes.
Will the pigmy rattlesnake population have more or less diversity?
A forest fire ignites in the Sam Houston State Forest and kills many members of a population of pigmy rattlesnakes.
Will the pigmy rattlesnake population have more or less diversity?
A road is built that separates two populations of Texas tortoises.
How is gene flow affected?
A road is built that separates two populations of Texas tortoises.
Will diversity increase or decrease?
A road is built that separates two populations of Texas tortoises.
Is this good for the tortoise populations or bad for the tortoise populations?
A land bridge is built over the same road to allow for the tortoise populations to mix again.
How is gene flow affected?
A land bridge is built over the same road to allow for the tortoise populations to mix again.
Will variation in the population increase or decrease?
A land bridge is built over the same road to allow for the tortoise populations to mix again.
Is this good for the tortoise populations or bad for the tortoise populations?
A small group of passengers gets shipwrecked on an island and found a new population. One of the individuals who founded the new population had a rare, genetic disorder which causes short limbs and extra digits. Now, many within the population show this trait.
Gene flow is important because it increases genetic diversity! When gene flow is present it increases the variation (differences) in a population.
Which picture above shows a population with genetic diversity /variation?
So, why does genetic diversity and varaition matter?
When organisms are genetically diverse and have more variation in their traits, it increases the likelihood that some will survive if the environment change.
Why is genetic diversity important?
On Day 1, what alleles/genes (letters) do all of the beetles in the green population have?
(click ALL THAT APPLY)
On Day 1, what alleles/genes (letters) do all of the beetles in the brown population have?
On Day 10, what alleles/genes (letters) do all of the beetles in the green population have? (click ALL THAT APPLY)
On Day 20, what alleles/genes (letters) do all of the beetles in the green population have?
(click ALL THAT APPLY)
What happened to number of different gene pairs (ex: bb or BB) found in the green beetle population over time?
On Day 1, what alleles/genes (letters) do all of the beetles in the brown population have?
(click ALL THAT APPLY)
On Day 10, what alleles/genes (letters) do all of the beetles in the brown population have?
(click ALL THAT APPLY)
On Day 20, what alleles/genes (letters) do all of the beetles in the brown population have?
(click ALL THAT APPLY)
What happened to the number of different genes found in the brown beetle population over time?
As the amount of different genes in a population increases, so does the genetic diversity. Meaning if a population starts with only one gene type (ex:bb) and then over time gets more, the genetic diversity increases.
In this example what happened to the genetic diversity of the two populations over time?
What caused the changed in the genetic diversity?
(what do the arrows mean in the picture?)
