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9 Cards in this Set
- Front
- Back
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Lamarck |
First to suggest that life evolves through physical changes that enable organisms to succeed in their environment |
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Lyell |
Suggested that earth was very old and gradually changed through slow, accumulating processes such as erosion and earthquakes |
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Charles Darwin |
Did not say humans descended from apes, did say all mammals have a common ancestor |
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Evolution |
A measurable change in the allele frequency of a population over time |
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Describe Darwin's hypothesis for evolution |
The environment selects for certain alleles, environment selects for beneficial traits, environment selects against harmful or less useful genes |
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Natural selection |
The process of environmental influences that determine which traits will be passed on in greater frequency from generation to generation |
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Describe the concept of natural selection and apply to various examples |
These are most likely the fit individuals because they will survive and reproduce at a high frequency. Some individuals are unfit because they fail to survive and reproduce, if they reproduce their genes are passed on at a lower frequency |
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Explain how beneficial alleles enter a population |
Spontaneous mutation, genetic drift, migration |
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Spontaneous mutations |
Natural changes in DNA sequences of sex cells caused by environmental factors ex. Radiation & chemicals, mutation rates are low, most are harmful- cause disease, some are neutral, few can be beneficial- populations contain millions of individuals, individuals contain thousands of genes, probability some mutations will aid in fitness |
