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Bio. test chapter 13
Terms in this set (13)
How is survival of the fittest different from relative fitness.
relative fitness is the contribution an induvial makes to the gene pool
The survival of the fittest relates to natural selection and explains how certain characteristics can help some individuals survive.
Why is natural selection considered to be the main mechanism of adaptive evolution? Why not genetic drift, gene flow, or mutation.
Natural selection is the main mechanism of adaptive evolution because natural selection is considered to be mechanism. This is also because adaptive evolution is random compared to genetic drift and gene flow (which is not random)
What is the ultimate source of genetic variation? What is the source of most genetic variation in a population that reproduces sexually?
The ultimate source of genetic variation is mutation.
If reproduced sexually the sours is a result of a unique set of alleles inherited.
Why can't individuals evolve?
Evolution involves changes in the genetic makeup of a population over time. An individual's genetic makeup rarely changes during its lifetime.
What is homology? And how does it relate to molecular biology?
Homology is similarity in different species due to evolution from a common ancestor.
Molecular Biology relates to hereditary background which is documented in the DNA
How does homology, vestigial structures, and molecular biology relate to the evolutionary tree?
Homology, vestigial structures and molecular biology all relates to our ancestors and what characteristics they pasted down to us. The evolutionary tree explains how humans have evolved but still are related to our ancestors.
Why would we say natural selection is more of an editing process than a creative one?
Natural selection cannot create traits on demand, but instead it "edits" variation in a population by selecting traits that are best suited to the current environment.
Compare artificial selection and natural selection
In artificial selection, humans choose
In natural selection, the environment does the choosing
What was Darwin's phrase for evolution? What does it mean?
-Individuals do not evolve- populations do
This means that an animal/person/ plant can not evolve over its lifetime. Populations have to evolve themselves, this process takes more than a lift time.
What is the bottleneck effect? How has man amplified it?
-event that leaves a small surviving population/ unlikely to have the same genetic trait as other populations..
Man can help some populations survive. They also can create genes in certain different animals
Males with the most elaborate ornamentation may garner the most mates. How might choosing such a mate be advantageous to a female?
An elaborate display may signal good health and therefore good genes, which in turn could be passed along to the female's offspring.
Explain why the following statement is incorrect: Antibiotics have created resistant bacteria.
The use of antibiotics did not cause bacteria to make new alleles. Rather, antibiotic use has increased the frequency of alleles
Why to we say natural selection cannot produce the perfect organism?
This is because natural selection can only edit an organism and not make it perfect
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