WorksheetsVARIATION
Total questions: 20
Worksheet time: 12mins
Which one of the following shows discontinuous variation?
Eye colour
Height
Strength
Weight
Which one of the following shows continuous variation?
Blood group
Height
Male or female
Tongue rolling
What type of graph do we use for discontinuous variation?
A bell-shape
Bar chart
Line graph
Scatter Graph
All the genes in a population is the population’s
Genotype
Fitness
Gene flow
Gene pool
Natural selection changes allele frequencies in populations because some ______ survive and reproduce more successfully than others.
alleles
gene loci
individual organisms
gene pool
Sparrows with average-sized wings survive severe storms better than those with longer or shorter wings, illustrating
The bottleneck effect
Frequency-dependent selection
Stabilizing selection
Disruptive selection
The changes in gene frequency are caused by
mutation
genetic drift
natural selection
gene flow
Allopatric speciation is the
formation of new species from extrinsic isolation
formation of new species from intrinsic isolation
formation of new species from oceanic isolation
formation of new species from geographical isolation
Males of different species of the fruit fly Drosophila that live in the same parts of the Hawaiian island have different elaborate courtship rituals that involve fighting other males and stylized movements that attract females. What type of reproductive isolation does this represent?
Habitat isolation
Behavioral isolation
Temporal isolation
Gametic isolation
Some species of Anopheles mosquito live in brackish water, some in running freshwater, and others in stagnant water. What type of reproductive barrier is most obviously separating these different species?
Behavioral isolation
Temporal isolation
Habitat isolation
Gametic isolatio
Two species of frogs belonging to the same genus occasionally mate, but the offspring do not complete development. What is the mechanism for keeping the two frog species separate?
The prezygotic barrier called hybrid sterility
The postzygotic barrier called hybrid inviability
The postzygotic barrier called hybrid breakdown
Gametic isolation
Which of the following contribute to the evolution of new species?
I gene mutation
II polyploidy
III natural selection
IV hybridization
I, II and III
II, III and IV
I, II and IV
I, II, III and IV
Which of the following shows the characteristics of continuous variation?
I control by polygenes
II shown by qualitative characteristics
III influenced by environmental factors
IV the classes show a normal distribution
I, II and III
II, III and IV
I, III and IV
I, II, III and IV
select type of natural selection for the following statements.
An African butterfly species exists in two strikingly different color patterns
Stabilizing selection
Disruptive selection
Directional selection
Artificial selection
What is the cause for all variation within a population?
Natural Selection
Mutation
Adaptation
Environmental Changes
An organism's ability to survive and reproduce in its environment refers to its
Fitness
Selection
Variation
Mutation
When has speciation occurred?
When populations no longer look the same
When populations are living in different environments
When populations no longer have the same frequency of alleles
When populations can no longer interbreed
In natural selection, the selective agent is the
humans
breeders
mutations
environment
A horse and a donkey can successfully mate to produce offspring known as a mule. Mules are sterile . Would mules be classified as a species?
Yes, mules have enough of their own traits to be considered a species.
No, mules are too similar to the parent species
Yes, the fact that have different number of chromosomes makes them a different species
No, due to their inability to reproduce successfully.
What type of genetic drift occurs when the population size is greatly decreased due to a random event?
Founder's Effect
Intrasexual Selection
Bottleneck Effect
Intersexual Selection
