Bio 117 Exam 1 Questions And Correct Detailed
Answers With Complete Solutions | Graded A+
What is an adaptation? - ANSWERS a trait that improves the fitness of its
bearer, compared with individuals without the trait
How can biological fitness be estimated? - ANSWERS Count the number of
healthy, fertile offspring produced by different individuals in a population.
All of the following are true for natural selection EXCEPT:
- Variation exists in populations (all individuals are NOT the same).
-Characteristics acquired by individuals over the course of their lifetime, e.g. big
muscles from weight lifting are passed on to their offspring.
-There is differential reproductive success within populations, i.e. some individuals
have more offspring than others.
-The fittest individuals leave the most offspring. - ANSWERS Characteristics
acquired by individuals over the course of their lifetime, e.g. big muscles from
weight lifting are passed on to their offspring.
What is a main driving force behind natural selection? - ANSWERS The
environment
Vestigial traits are _____. - ANSWERS remnants of structures that were useful
to an organism's ancestors
, TRUE/FALSE: New traits in a population arise (come into existence) in response to
need (i.e. NEED can evoke new alleles in a population). - ANSWERS False
New alleles originate from _______. - ANSWERS mutations
According to ________, traits acquired during an individual's lifetime will be
inherited by offspring. - ANSWERS Lamarck
Allele frequencies change as a result of __________.
-Mutation
-Genetic drift
-Gene flow (immigration/emigration)
-Natural selection
-All of the above - ANSWERS All of the above
TRUE/FALSE: Changes in a population occur through small changes in individual
members of a population over a very long period of time. - ANSWERS True
Animals that possess homologous structures probably _____. - ANSWERS
evolved from the same ancestor
When they were first sold, aerosol insecticides were highly effective in killing flies
and mosquitoes. Now, several decades later, a much smaller proportion of these
insects die when sprayed. The reason fewer insects die when they are sprayed is
that _____. - ANSWERS many mosquitoes today are descendants of
mosquitoes with insecticide-resistant characteristics
Answers With Complete Solutions | Graded A+
What is an adaptation? - ANSWERS a trait that improves the fitness of its
bearer, compared with individuals without the trait
How can biological fitness be estimated? - ANSWERS Count the number of
healthy, fertile offspring produced by different individuals in a population.
All of the following are true for natural selection EXCEPT:
- Variation exists in populations (all individuals are NOT the same).
-Characteristics acquired by individuals over the course of their lifetime, e.g. big
muscles from weight lifting are passed on to their offspring.
-There is differential reproductive success within populations, i.e. some individuals
have more offspring than others.
-The fittest individuals leave the most offspring. - ANSWERS Characteristics
acquired by individuals over the course of their lifetime, e.g. big muscles from
weight lifting are passed on to their offspring.
What is a main driving force behind natural selection? - ANSWERS The
environment
Vestigial traits are _____. - ANSWERS remnants of structures that were useful
to an organism's ancestors
, TRUE/FALSE: New traits in a population arise (come into existence) in response to
need (i.e. NEED can evoke new alleles in a population). - ANSWERS False
New alleles originate from _______. - ANSWERS mutations
According to ________, traits acquired during an individual's lifetime will be
inherited by offspring. - ANSWERS Lamarck
Allele frequencies change as a result of __________.
-Mutation
-Genetic drift
-Gene flow (immigration/emigration)
-Natural selection
-All of the above - ANSWERS All of the above
TRUE/FALSE: Changes in a population occur through small changes in individual
members of a population over a very long period of time. - ANSWERS True
Animals that possess homologous structures probably _____. - ANSWERS
evolved from the same ancestor
When they were first sold, aerosol insecticides were highly effective in killing flies
and mosquitoes. Now, several decades later, a much smaller proportion of these
insects die when sprayed. The reason fewer insects die when they are sprayed is
that _____. - ANSWERS many mosquitoes today are descendants of
mosquitoes with insecticide-resistant characteristics
