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If an allele makes up one fourth of a population’s alleles for a given trait, its relative frequency is
somewhat similar species with traits that suited their particular environment.
neuron
gene shuffling and mutations.
a record of evolution.
25%
phenotypes
decreased birthrate and emigration
geographic
The separation of populations by barriers such as rivers, mountains, or bodies of water is called ____________ isolation.
somewhat similar species with traits that suited their particular environment.
neuron
gene shuffling and mutations.
a record of evolution.
25%
phenotypes
decreased birthrate and emigration
geographic
The two main sources of genetic variation are
somewhat similar species with traits that suited their particular environment.
neuron
gene shuffling and mutations.
a record of evolution.
25%
phenotypes
decreased birthrate and emigration
geographic
Which are two ways a population can decrease in size?
somewhat similar species with traits that suited their particular environment.
neuron
gene shuffling and mutations.
a record of evolution.
25%
phenotypes
decreased birthrate and emigration
geographic
Darwin viewed the fossil record as
somewhat similar species with traits that suited their particular environment.
neuron
gene shuffling and mutations.
a record of evolution.
25%
phenotypes
decreased birthrate and emigration
geographic
Natural selection acts directly on
somewhat similar species with traits that suited their particular environment.
neuron
gene shuffling and mutations.
a record of evolution.
25%
phenotypes
decreased birthrate and emigration
geographic
On the Galápagos Islands, Charles Darwin observed
somewhat similar species with traits that suited their particular environment.
neuron
gene shuffling and mutations.
a record of evolution.
25%
phenotypes
decreased birthrate and emigration
geographic
What is the basic unit (cell) of the nervous system?
somewhat similar species with traits that suited their particular environment.
neuron
gene shuffling and mutations.
a record of evolution.
25%
phenotypes
decreased birthrate and emigration
geographic
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