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- author "me"
- tags ""
- description "Biodiversity and Evolution"
- fileName "Bio 9 Chapter 4"
- freezingBlueDBID -1.0
- Define species.
- A set of individuals that can mate and produce fertile offspring.
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True/False: The number of identifed species is 3 million.
False. It is 2 million.
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How many species are there likely to be?
10-14 million.
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What is the bottleneck effect?
Due to the large number of a species that has died, there is less variablity in the genes.
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What are biomes?
The terrestrial portion of the biosphere.
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How do insects help the environment?
They help with pollination, pest control, and soil renewal.
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What is the theory of evolution?
That all species descnded from earlier, ancestral species.
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Explain natural selection.
Genes of some individuals give rise to traits that enhance survivability and reproduction - passing on these traits.
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How does a population change over time?
It becomes genetically different.
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How does genetic variability occur?
Through random, sometimes spontaneous, changes in DNA molecules, and external agents (such as radiation). This can create an inheritable trait.
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True/False: Inherited traits are advantageous, neutral, or deletrious.
True.
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True/False: You have a higher chance of inheriting a deletrious trait.
False. The less beneficial a trait is, the lesser the chance that you'll get it.
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Define adaptive traits.
Genetically favorable traits that increase survivorship and reproduction.
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What are the three outcomes for a species faced with environmental change?
The species can either adapt through evolution, migrate, or become extinct.
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How does evolution occur by natural selection.
Genes mutate, individuals and traits are selected, and populations evolve, leaving them better suited to survive current environmental conditions.
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