Science Flashcards
Speciation
Is the tide of two or more species from one existing species
Intersexual selection
Males display certain traits to females
Genetic drift
Is a change in allele frequencies due to chance
Does genetic drift have a negative effect on a population
Yes
What is the founder effect
The founder effect is a genetic drift that occurs after start of new population
True or false:A population bottleneck can lead to genetic drift
True
True or false:Gene flow keeps neighboring populations similar
True
When does geographic occur
When physical barriers divide population
When does temporal isolation happen
When timing of reproductive periods prevents mating
When does genetic drift occur
When an event drastically reduces population size
True or false:Natural selection is not the only mechanism through which populations evolve.
True
Can temporal barriers cause isolation
Yes
Intrasexual selection
Competition among males
Does population become isolated when there is no gene flow
Yes
Emigration
Is the process of leaving a population
Can Populations become isolated in several ways
Yes
When does gene flow occur
When individuals join new populations and reproduce
Does Behavioral isolation includes different in courtship or mating behaviors
Yes
When can reproductive isolation occur
Can occur between isolated populations; occurs when member of different populations connor mate successfully
Can behavioral Barriers cause isolation
Yes
Gene flow
Is the movement of alleles between populations
What does genetic drift cause
A loss of genetic diversity and is most common in small populations
Immigration
Is the process of joining a new population
When does sexual selection occur
It occurs when certain traits increase mating success and occurs due to higher closet of reproduction for females
Is it less or more likely to have some individuals that can adapt
Less
True or false: harmful alleles can become more common due to chance
True
What happened when you have a low gene flow
Increases the chance that two populations will evolve into different species
True of false: the founding of a small population can lead to genetic drift
True
