Mechanisms of Evolutionary Change
Biology ⇒ Evolution and Diversity
Mechanisms of Evolutionary Change starts at 10 and continues till grade 12.
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Describe how a population bottleneck can affect genetic diversity.
Describe how genetic drift can lead to the fixation or loss of alleles in a population.
Describe the difference between gene flow and genetic drift.
Describe the effect of gene flow on the genetic structure of populations.
Describe the role of environmental changes in driving natural selection.
Explain how disruptive selection can lead to speciation.
A population of beetles has two color morphs: green and brown. Birds preferentially eat green beetles, so brown beetles survive and reproduce more. What type of selection is this? (1) Stabilizing selection (2) Directional selection (3) Disruptive selection (4) Balancing selection
A population of rabbits is isolated on an island. Over generations, their fur color changes due to random events, not selection. This is an example of __________.
A population of beetles has two color morphs: green and brown. Birds preferentially eat green beetles, so brown beetles survive and reproduce more. What type of selection is this? (1) Stabilizing selection (2) Directional selection (3) Disruptive selection (4) Balancing selection
Which mechanism of evolution is most likely to increase genetic variation in a population? (1) Genetic drift (2) Natural selection (3) Mutation (4) Bottleneck effect
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 appearance of new species
Which of the following is an example of directional selection? (1) Both extremes are favored (2) The average phenotype is favored (3) One extreme phenotype is favored (4) All phenotypes are equally favored
A population of rabbits is isolated on an island. Over generations, their fur color changes due to random events, not selection. This is an example of __________.
Stabilizing selection tends to __________ genetic variation in a population.
The founder effect occurs when a small group of individuals establishes a new population. This is an example of __________.
The movement of alleles from one population to another is called __________.
True or False: Bottleneck effect is a type of genetic drift.
True or False: Evolution always leads to more complex organisms.
True or False: Evolution can occur without changes in allele frequencies.
True or False: Evolution is a process that occurs at the level of individuals.
