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9A (DNA (Sex chromosome (Girls: Two X chromosomes, Boys: One X chromosome…
9A
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Genes & Extinction
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Changes in an ecosystem can affect species in an area because they might not adapt a well to the new conditions
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Environmental Variation
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Hair color, language, hair length are all examples of environmental variation
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Height, skin color, and weight are caused by both environmental and inherited variation
Continuous variation is variations that can take any value between two points. eg. hair length, height
Discontinuous variation is variations that can only have a value from a limited set of possible values
Inherited Variation
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Instruction of the inherited variation is stored in genetic information found in the nucleus of cells
In sexual reproduction, two gametes fuse during fertilization and forms a zygote. The zygote contains characteristics from both parents.
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Examples of inherited variation is natural skin color, eye color, blood group and certain types of disease
Natural Selection
The environment is 'selecting' certain genetic variations in characteristics, which are passed on to the next generation
Evolution
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As evolution occurs, a population can become a new species
Individuals that are better at competing for resources will survive and reproduce and the offspring will have the same characteristic