Term
| What is a random change to genetic material ? |
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Definition
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Term
| What three possible types of effect can mutuations have on an organisms chances of survival? |
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Definition
| neutral, advantage or a disadvantage |
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Term
| What words describe the occurence of mutations? |
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Definition
| rare, random, spontaneous |
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Term
| What is the only source of new alleles for a species? |
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Definition
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Term
| Name two factors that can increase the rate of mutation. |
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Definition
| radiation (x rays, gamma rays, UV light) chemicals eg mustard gas |
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Term
| Define the term 'adaptation'. |
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Definition
| is an inherited characteristic that makes an organism well suited to survival in its environment/niche. |
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Term
| Within a population what makes it possible for a population to evolve over time in response to changing environmental conditions? |
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Definition
| variation within the population |
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Term
| Name some selection pressures. that can cause natural selection |
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Definition
| lack of food / cold / predation / disease |
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Term
| What is another term for natural selection? |
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Definition
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Term
| Which individuals will survive and reproduce under the influence of selection pressures? |
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Definition
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Term
| State the three types of isolation barrier for speciation. |
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Definition
| geographical, ecological or behavioural |
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Term
| Give an exapmle of a geographical barrier. |
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Definition
| river / mountain / desert |
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Term
| Give an exapmle of a ecological barrier. |
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Definition
| pH, salinity or different habitats |
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Term
| Give an exapmle of a behavioural barrier. |
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Definition
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Term
| What key event happens during the process of speciation after the population has been split by an isolation barrier |
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Definition
| different mutations in the two sub-populations |
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Term
| How will you know when a new species has been formed by speciation? |
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Definition
| the two populations can no longer interbreed and produce fertile offspring |
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