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BIO 121 Exam 1 Review Spring 2024 | Questions with Complete Answers.
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BIO 121 Exam 1 Review Spring 2024 | Questions with Complete Answers.
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BIO 121 Exam 1 ReviewSpring 2024
Evolution
Answer The gradual change in a species over time.
Adaptation
Answer When the heritable trait increases an individuals fitness
in a particular environment.
Ancestral trait
Answer Is a character that existed in an ancestor.
Derived trait
Answer Is one that is a modified form of the ancestral trait,
found in a descendants.
Vestigial trait
, Answer A reduced or incompletely developed structure that has
no (or reduced) function (e.g. human tailbone or wisdom teeth).
Homologous structures
Answer Are similarities that exist in species descended from a
common ancestor (e.g. humans, dogs, and birds have similar
limb structure).
Convergent evolution
Answer Occurs when similar environmental pressures and
natural selection give rise to similar (analogous) structures in
distantly related organisms.
Dispersal
Answer The movement of organisms or individuals from one
place to another can result in Allopatric Speciation (e.g. birds
flying to a new island).
Vicariance
Answer The physical splitting of a habitat, some type of
geographic barrier can result in Allopatric Speciation. (e.g.
rivers or mountains splitting populations).
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