Mechanisms of Evolutionary Change
Biology ⇒ Evolution and Diversity
Mechanisms of Evolutionary Change starts at 10 and continues till grade 12.
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A population of beetles is split by a river, and over time, the two groups evolve differently. This is an example of which mechanism of evolutionary change?
A population of rabbits is reduced from 1000 to 10 due to a natural disaster. The surviving rabbits have different allele frequencies than the original population. What is this an example of?
A scientist observes that a certain allele becomes more common in a population because it helps individuals survive a new disease. Which mechanism of evolution is at work?
Describe how artificial selection differs from natural selection.
A population of 1000 individuals has 400 AA, 500 Aa, and 100 aa genotypes. Calculate the frequency of the a allele.
A population of beetles is split by a river, and over time, the two groups evolve differently. This is an example of which mechanism of evolutionary change?
A population of rabbits is reduced from 1000 to 10 due to a natural disaster. The surviving rabbits have different allele frequencies than the original population. What is this an example of?
A scientist observes that a certain allele becomes more common in a population because it helps individuals survive a new disease. Which mechanism of evolution is at work?
Which mechanism of evolution is most likely to increase genetic variation within a population? (1) Genetic drift (2) Gene flow (3) Natural selection (4) Non-random mating
Which of the following best describes natural selection? (1) Random changes in allele frequency (2) Differential survival and reproduction of individuals due to differences in phenotype (3) Movement of alleles between populations (4) Sudden reduction in population size
Which of the following is an example of directional selection? (1) Birds with average-sized beaks survive best (2) Only the largest fish are caught by fishermen, so smaller fish become more common (3) Both very light and very dark moths survive better than medium-colored moths (4) Random mating occurs in a population
Which of the following is an example of disruptive selection? (1) Only the largest individuals survive (2) Both very small and very large individuals survive better than medium-sized ones (3) Average-sized individuals survive best (4) Random changes in allele frequency
Fill in the blank: __________ selection occurs when individuals with intermediate phenotypes are favored over those with extreme phenotypes.
Fill in the blank: __________ selection occurs when individuals with traits that are attractive to the opposite sex have higher reproductive success.
Fill in the blank: The __________ effect occurs when a few individuals start a new population, leading to a loss of genetic diversity.
Fill in the blank: The change in allele frequencies in a population over generations is called __________.
True or False: All mutations are passed on to the next generation.
True or False: Bottleneck effect is a type of genetic drift.
True or False: Evolution can occur without natural selection.
True or False: Evolutionary change can only occur over millions of years.
