Show:
Population
Natural Selection
and Evolution
Evolution Cont.
Isolation
Misc.
100
True or False? Evolution means that a population undergoes changes in its gene frequencies over time.
True
100
A result in the loss of genetic variation from small populations
What is genetic drift
100
Finish the sentence : According to the modern synthesis of evolution...
Genetics and mutation generate some of the variety that natural selection acts on.
100
What can cause geographic isolation?
A volcanic eruption.
100
How does speciation take place (on a genetic level) once a population has been isolated and split in two?
Allele frequencies change in different ways.
200
Mutation, genetic recombination, and gene flow.
What is genetic variation?
200
The most powerful evolutionary force in large populations over time
What is natural selection
200
When a species diverges from a common ancestor
What is descent with modification
200
What happens after two segments of a population are geographically isolated?
In time they becom separate apecies.
200
If the frequency of q of a trait is 0.4, what is the frequency of p?
0.6
300
True or False Populations are all the individuals of a species living in a defined area.
True.
300
Why do scientists study proteins in order to find evidence for evolution?
Because proteins reflect DNA sequences and scientists can look for genetic similarities and differences in organisms.
300
When flightless birds have wings.
What is vestigaial structure?
300
Why do organisms of the same species eventually become different over time, after isolation?
They are exposed to differenent environments.
300
If the frequency of p=0.8 what is the frequency of the heterozygous genotype?
0.32
400
All cacti in the same area
What is population
400
All life on Earth originated from which type of organism?
Single-cell prokaryotes
400
Forelimbs of mice, bats, and whales all have similar bone structures.
What is homologous structures?
400
What is the cause of speciation?
A population division.
400
genetic diversity in a population
What is genetic variation?
500
A characteristic that helps an organism survive and reproduce
What is adaptation
500
3.5 billion years ago
When did life on Earth begin?
500
Structures that are so similar that they imply a common ancestor
What is homologous structures?
500
True or False After two populations are no longer the same species, they can still successfully reproduce with one another
Fase
500
The study of similarities and differences in the anatomy of different organisms
What is comparative anatomy?