
ET 4/20
Authored by Sarah Kim
Science
8th Grade

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15 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Which statement BEST explains why natural selection acts on an organism’s phenotype rather than on its genotype?
More than one phenotype can result from the same genotype.
More than one genotype can result in the same phenotype.
Both homozygous genotypes result in the same phenotype
Only heterozygous phenotypes result from the same genotype.
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Which statement is MOST likely the explanation of why certain animals are able to adapt to changing environments?
Some species have a greater variation in their genetic makeup.
Some species have mostly dominant genes.
Some species have unlimited habitats.
Some species react by mutating.
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Look at the phylogenetic tree above.
Which hypothetical organism is the most recent common ancestor for Organisms A and G?
1
2
3
4
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
When do mutations help make an ecosystem more sustainable?
when mutations decrease the number of individuals in an ecosystem
when mutations increase the number of individuals in an ecosystem
when mutations decrease the number of species in an ecosystem
when mutations increase the number of species in an ecosystem
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A
B
C
D
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Researchers have discovered that the ear bones of mammals are homologous to some bones in fish jaws. Which claim is BEST supported by this fact?
Fish do not require a sense of sound.
Fish and mammals have a distant common ancestor.
Selection pressures have acted over time on mammals but not fish
Selection pressures have promoted similar evolution in fish and mammals.
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A cow and a frog have similar bone structures in their forelimbs. Both have phalanges and radius, ulna, and humerus bones. However, the cow and frog are animals with very different life cycles from each other. Which MOST likely describes why the body structures of these animals are so similar?
Both have undergone similar mutations.
Both descended from a common ancestor
Both reacted similarly to environmental pressures
Both spread out from the same geographical region.
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