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Questions and Answers
What is variation?
What is variation?
- A type of mutation.
- The lack of any differences.
- The differences in characteristics among individuals. (correct)
- The similarities in characteristics among individuals.
Alleles inherited by individuals are one cause of variation.
Alleles inherited by individuals are one cause of variation.
True (A)
Name one example of a genetic variation.
Name one example of a genetic variation.
Hair color
Environmental factors can also cause ________.
Environmental factors can also cause ________.
Flower color can vary depending on what environmental factor?
Flower color can vary depending on what environmental factor?
Language in humans is an example of genetically caused variation.
Language in humans is an example of genetically caused variation.
Which of these factors influences height in humans?
Which of these factors influences height in humans?
Mutations are random changes to ________.
Mutations are random changes to ________.
Most mutations have a large effect on the phenotype.
Most mutations have a large effect on the phenotype.
What is the source of genetic variation in a population?
What is the source of genetic variation in a population?
A mutation for tallness will always lead to a person being tall.
A mutation for tallness will always lead to a person being tall.
Eye color is a _ of a mutation that determines the phenotype.
Eye color is a _ of a mutation that determines the phenotype.
A mutation can never lead to a beneficial phenotype.
A mutation can never lead to a beneficial phenotype.
A mutation leading to a beneficial phenotype can cause _ in a species, especially if the environment changes.
A mutation leading to a beneficial phenotype can cause _ in a species, especially if the environment changes.
In the 1950s, a virus killed 99% of wild ______ in the UK.
In the 1950s, a virus killed 99% of wild ______ in the UK.
Initially, all rabbits were resistant to the virus in the UK.
Initially, all rabbits were resistant to the virus in the UK.
What made the surviving rabbits resistant to the virus?
What made the surviving rabbits resistant to the virus?
The mutation gave the rabbits a new ________.
The mutation gave the rabbits a new ________.
The beneficial phenotype is now NOT widespread in the UK rabbit population.
The beneficial phenotype is now NOT widespread in the UK rabbit population.
What is one mutation and phenotype given in the text?
What is one mutation and phenotype given in the text?
Flashcards
What is variation?
What is variation?
Differences in characteristics among individuals within a population.
What is genetic variation?
What is genetic variation?
Differences in alleles that are inherited by individuals.
What is environmental variation?
What is environmental variation?
Factors that cause differences in characteristics.
What are mutations?
What are mutations?
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What is phenotype?
What is phenotype?
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What is a beneficial mutation?
What is a beneficial mutation?
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Example of species change
Example of species change
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Give an example of genetic variation
Give an example of genetic variation
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Give an example of genetic variation
Give an example of genetic variation
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Study Notes
- Variation refers to the differences in characteristics among individuals within a population.
Causes of Variation
- Alleles inherited by individuals are one cause of variation, and these are genetic causes.
- Examples of genetic variation include hair color (red, blond, dark) and eye color (blue, brown).
- Environmental factors can cause variation.
- Flower color can vary depending on the pH of the soil.
- Language in humans is another example of an environmentally caused variation.
- Some variation results from a combination of genes and environment.
- Height in humans is influenced by both genetics (alleles for tallness) and environment (calcium intake in the diet).
Genetic Variation and Mutations
- Mutations are random changes to DNA and are the source of genetic variation in a population.
- Most mutations have no effect on the phenotype.
- Some mutations influence the phenotype if the environment is suitable (alleles for tallness may lead to tallness if a person's diet is suitable).
- Eye color is an example of a mutation that determines the phenotype.
- Rarely, a mutation can lead to a new and beneficial phenotype.
- This can cause rapid changes in a species, especially if the environment changes.
- In the 1950s, a virus killed 99% of wild rabbits in the UK.
- A mutation occurred which made the surviving rabbits resistant to the virus.
- This mutation gave the rabbits a new phenotype.
- The beneficial phenotype is now widespread in the UK rabbit population.
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