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WorksheetsVariation
Total questions: 30
Worksheet time: 28mins
When we say that an individual organism has a greater fitness than other individual, we specially mean that organism
lives longer than other of its species
competes for resources more successfully than others of its species
mates more frequently than others of its species
leaves more viable offspring than others of its species
Cattle breeders have improved the quality of meat over the years by which process?
Artificial selection
Directional selection
Stabilizing selection
A and B
What is the result of natural selection?
A chance change in the gene pool of a small population
The entry of alleles into a population due to immigration
A change in the gene pool of a population due to differential reproductive success
A change in allelic frequencies due to mutation
All the genes in a population is the population’s
Gene pool
Fitness
Genotype
Gene flow
The average length of jackrabbit ears decreases gradually with increasing latitude. This variation is an example of
Directional selection
Discrete variation
Polymorphism
Genetic drift
Which of the following is a polymorphic trait in humans?
Variation in intelligent
Variation in height
Free versus attached earlobes
Variation in the number of fingers
Natural selection changes allele frequencies in populations because some ______ survive and reproduce more successfully than others.
alleles
individual organisms
gene loci
gene pool
No two human individuals are alike, except for identical twins. The chief cause of the variation among individuals is
new mutations that occurred in the preceding generation
sexual recombination
genetic drift due to the small size of the population
geographic variation within the population
Sparrows with average-sized wings survive severe storms better than those with longer or shorter wings, illustrating
The bottleneck effect
Stabilizing selection
Frequency-dependent selection
Disruptive selection
Human blood group is an example of
Continuous variation
Discontinuous variation
Extrinsic variation
Intrinsic variation
The changes in gene frequency are caused by
mutation
natural selection
genetic drift
gene flow
Allopatric speciation is the
formation of new species from geographical isolation
formation of new species from intrinsic isolation
formation of new species from extrinsic isolation
formation of new species from oceanic isolation
Autopolyploidy is a speciation process that begins with an event during
habitat selection
copulation
meiosis
embryonic development
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
Temporal isolation
Behavioral 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?
Habitat isolation
Temporal isolation
Behavioral isolation
Gametic isolation
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 postzygotic barrier called hybrid inviability
The postzygotic barrier called hybrid breakdown
The prezygotic barrier called hybrid sterility
Gametic isolation
Which of the following is not example of continuous variation?
Height of human
Weight of human
Length of an elephant’s trunk
ABO blood group
Which of the following contribute to the evolution of new species?
I isolation
II adaptive radiation
III natural selection
IV hybridization
I, II and III
I, II and IV
II, III and IV
I, II, III and IV
Species can be stated as follows
it may consists of one or more populations
whose members show high similarity in the phenotype characteristics
members can be interbreed, producing viable fertile offspring
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
I, III and IV
II, III and IV
I, II, III and IV
A certain species of land snail exists as either a cream color or a solid brown color. Intermediate individuals are relatively rare
Stabilizing selection
Directional selection
Disruptive selection
Breed an organism for a desired trait by human is the definition of
artificial selection
natural selection
natural breeding
biological evolution
What is most likely to happen to moth populations in the picture shown?
Light moths--hunted easily, dark moths--population increase
Dark moths--hunted easily, dark moths--population increase
Light moths--hunted easily, light moths--population increase
Lights moths will change their color to match dark moths.
Genetic drift decreases genetic variation because a random event in a small population will change the allele frequencies.
True
False
Bottleneck effect and founder effect change the allele frequencies by resulting certain allele to be overrepresented or eliminated in the future population
True
False
Speciation begins with no gene flow between two subpopulation for a very long period of time.
True
False
