Bio 1111 Exam 1 Chapters 22-26 Questions With Complete
Solutions
Are analogous structures evidence of a common ancestor?
Correct Answers no, they are similar characteristics that
evolved independently and are usually a result of evolution due
to similar environment
Are mutations random? Correct Answers yes
Are mutations usually beneficial? Correct Answers no, most
result in deleterious alleles with lowered fitness
Are traits one acquires during their lifetime passed on to
offspring? Correct Answers no
Can fossils themselves be dated? Correct Answers no but the
rocks around them can so it tells the relative time it died
Do indviduals evolve? Correct Answers no, populations do
Do patterns of descent need to look similar? Correct Answers
no
Do sympatrics or allopatrics usually mate? Correct Answers
allopatrics
Does natural selection act on only one trait at once? Correct
Answers no it acts on many traits a once and cannot optimize
all traits in organisms
,Evidence for meteoroid? Correct Answers iridium, shocked
quarts, microtektites, and crater in ocean
How do adaptations arise? Correct Answers from changes to the
environment
How do you date old rocks? Correct Answers half life
How does genetic isolation occur? Correct Answers Occupy
different geographic areas, use different habitats or resources
within same area, polyploidy
If a physical barrier appears too quickly what can happen?
Correct Answers divergence can be too rapid
Is a population in Hardy-Weinberg equilibrium evolving?
Correct Answers no
Is genetic drift random? Correct Answers yes (ex. drunkards
walk)
Is natural selection a chance event? Correct Answers no it
favors selected traits over unfavorable ones so that the good
ones can be passed on
Is natural selection a quick process? Correct Answers no, it
takes a long period of time
Is natural selection random? Correct Answers no
Is speciation quick or slow? Correct Answers both
, Phylogenetic trees are... Correct Answers hypothesis (an
estimate)
Trees only show what? Correct Answers ancestors unless
otherwise stated
What 2 parts of the precambrian period has rock reccords
Correct Answers Archean and Protozoic
What are 2 types of sexual selection? Correct Answers Female
choice where females should be choosey and male-male
competition where males compete with each other for mates
What are 3 inferences about the Origin of Species? Correct
Answers 1. Individuals whose inherited traits give them a
higher probability of surviving and reproducing in a given
environment tend to leave more offspring
2. This unequal ability of individuals to survive and reproduce
will lead to a gradual change in a population, with favorable
characteristics accumulating over the generations.
3. Production of more individuals than the environment can
support leads to a struggle for existence among individuals of a
population, with only a fraction of offspring surviving each
generation.
What are 5 evolutionary mechanisms? Correct Answers Natural
selection, sexual selection, Genetic Drift, Gene Flow, Mutation
What are adaptations? Correct Answers traits that enhances
one's survival that must be inherited not acquired
Solutions
Are analogous structures evidence of a common ancestor?
Correct Answers no, they are similar characteristics that
evolved independently and are usually a result of evolution due
to similar environment
Are mutations random? Correct Answers yes
Are mutations usually beneficial? Correct Answers no, most
result in deleterious alleles with lowered fitness
Are traits one acquires during their lifetime passed on to
offspring? Correct Answers no
Can fossils themselves be dated? Correct Answers no but the
rocks around them can so it tells the relative time it died
Do indviduals evolve? Correct Answers no, populations do
Do patterns of descent need to look similar? Correct Answers
no
Do sympatrics or allopatrics usually mate? Correct Answers
allopatrics
Does natural selection act on only one trait at once? Correct
Answers no it acts on many traits a once and cannot optimize
all traits in organisms
,Evidence for meteoroid? Correct Answers iridium, shocked
quarts, microtektites, and crater in ocean
How do adaptations arise? Correct Answers from changes to the
environment
How do you date old rocks? Correct Answers half life
How does genetic isolation occur? Correct Answers Occupy
different geographic areas, use different habitats or resources
within same area, polyploidy
If a physical barrier appears too quickly what can happen?
Correct Answers divergence can be too rapid
Is a population in Hardy-Weinberg equilibrium evolving?
Correct Answers no
Is genetic drift random? Correct Answers yes (ex. drunkards
walk)
Is natural selection a chance event? Correct Answers no it
favors selected traits over unfavorable ones so that the good
ones can be passed on
Is natural selection a quick process? Correct Answers no, it
takes a long period of time
Is natural selection random? Correct Answers no
Is speciation quick or slow? Correct Answers both
, Phylogenetic trees are... Correct Answers hypothesis (an
estimate)
Trees only show what? Correct Answers ancestors unless
otherwise stated
What 2 parts of the precambrian period has rock reccords
Correct Answers Archean and Protozoic
What are 2 types of sexual selection? Correct Answers Female
choice where females should be choosey and male-male
competition where males compete with each other for mates
What are 3 inferences about the Origin of Species? Correct
Answers 1. Individuals whose inherited traits give them a
higher probability of surviving and reproducing in a given
environment tend to leave more offspring
2. This unequal ability of individuals to survive and reproduce
will lead to a gradual change in a population, with favorable
characteristics accumulating over the generations.
3. Production of more individuals than the environment can
support leads to a struggle for existence among individuals of a
population, with only a fraction of offspring surviving each
generation.
What are 5 evolutionary mechanisms? Correct Answers Natural
selection, sexual selection, Genetic Drift, Gene Flow, Mutation
What are adaptations? Correct Answers traits that enhances
one's survival that must be inherited not acquired
