theorized that populations can grow faster than resources are made
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What did Darwin observe?
differences among island species
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What are antibiotics?
medicines that kill or slow down the growth of bacteria
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What is genetic drift?
random change in allele frequency
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what is natural selection?
The idea that the fittest survive and pass along their traits to their offspring.
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What is gene flow/migration?
Movement of individuals of a species from one population to another
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What is Hardy-Weinberg equilibrium?
states that allele and genotype frequencies in a population will remain constant from generation to generation in the absence of other evolutionary influences.
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what does homologous mean?
having the same structure
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What is a vestigial structure?
A structure that was once used in earlier descendants but lost its use over time
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Evidence of Evolution
- fossils - similar structures - geographic distribution
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What does terrestrial mean?
Land based
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what is needed for evolution to occur?
variation, , selection, time
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What is the founder effect?
small group from a population colonizes a new area
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in a sickle cell, individuals who are homozygous dominant are more likely to suffer from malaria (T OR F)
True
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what is the original source of genetic variation?
mutations
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what is genetic variation?
differences that occur in individuals within a species
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What is the bottleneck effect?
A change in allele frequency following a dramatic reduction in the size of a population
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What is directional selection?
when individuals at one end of the curve have higher fitness than individuals in the middle or at the other end
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What is stabilizing selection?
when individuals near the center of the curve have higher fitness than individuals at either end
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What is artificial selection?
The breeding of plants and animals to produce desirable traits
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darwins view on heritable traits
Characteristics acquired during an organisms life are not passed on through genes.
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lamarks views on heritable traits
Characteristics acquired during an organisms life are passed on through genes. The idea of use and disuse as a selective measure
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Why is Charles Darwin noted for his work in natural selection and evolution?
Devised a mechanism for evolution that was supported by evidence.
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What are the principles guiding the idea of natural selection?
-the best-adapted individuals tend to leave the most offspring. -individuals who survive longer tend to leave more offspring than those who die young. -populations tend to produce more individuals than the environment can support. -genetic variation exists within populations.