BIO 1108 EXAM QUESTIONS AND
ANSWERS A+ GRADED
All the alleles present in all individuals in a population are referred to as the ___
of that species
gene pool
in general, in sample of n individuals the frequency of an allele is
the number of occurrences of the allele divided by twice the number of individuals in the
sample (2n)
at the genetic level, evolution is
a change in the frequency of an allele or genotype over time
the differential success of alleles is called
selection
natural selection that increases the frequency of a favorable allele is called..
positive selection
the non-adaptive mechanism of evolutionary change are
migration, mutation and genetic drift
a hypothetical endangered species of wildflower has been reduced to a single
small population in a mountain meadow. a rare early spring blizzard kills all but 3
of the remaining plants, one of which has a rare mutation. this is an example of
genetic drift/bottleneck
when you use a field guide to identify a species by its appearances, you are
applying the
morphospecies concept
a population that exhibits any one allele at a particular gene is _____ for that
allele
fixed
which of the following is a condition of the hardy-weinberg equilibrium
random mating, no mutation, no migration, and no differences in the survival and
reproductive success of individuals
for species determination of a sexual organism, it is useful to use _____
ecological species concept and evolutionary species concept
unlike the biological species concept the morphospecies concept relies on ..
phenotype
a drawback of the biological species concept it that it cannot be applied to
extinct organisms
2 individuals are members of the same species if they
can produce fertile offspring
2 populations are the same species if they can successfully breed with each
other. true or false?
true
you are studying reproduction in a species of frog. two gametes that are diploid
join to form a viable zygote. if the F1 mates with one of the parents will there be a
viable offspring?
, no
horses and donkeys can interbreed, but their offspring (mules) are infertile. this is
an example of what kind of reproductive isolating mechanism
post-zygotic, genetic seperation
____ is the process by which diverging populations undergo natural selection in
favor of enhanced pre-zygotic isolation
reinforcement
___ is the process in which 2 groups of organisms living in the same habitat
diverge into seperate species
sympatric speciation
several species of fireflies are active on the same summer nights in the same
field. males and females recognized one another by their distinctive flashing
patterns. this is an example of what kind of reproductive isolation
pre-zygotic, behavioral isolation
which of the following characteristics of development is unique to animals
changes in cell postion
the major evolutionary split of bilaterian animals was based on _____
the developmental patterns
the advantages of the amniotic egg includes
the ability to result dessication in dry terrestrial habitats
a true coelom arises between layers of
mesoderm
comparative embryology helped clarify the relationships among major groups of
animals. the bilaterians, for example, can be divided into the _____ based on the
developmental fate of the blastopore
protostomes and duetrostomes
a close evolutionary relationship between annelids and mollusks is suggested by
the presence of a ____ in both phyla as well as by molecular sequence
companions
trochophore
cnidarians are able to capture prey with the aid of ___, harpoon-like organelles
that are often tipped with neurotoxins
cnidocyte
diploblastic organisms lack which germ layer
mesoderm
bilaterians develop specialized organs because they have
3 germ layers
cnidarians form the epithelial tissue.. true or false
true
___, such as sea squirts, share features of the chordate body plan during early
development
tunicates, cephalochordates
the ____ which includes the sharks, skates, and rays are unique in possessing
skeletons made of ___
chondrichtyes;cartilage
ANSWERS A+ GRADED
All the alleles present in all individuals in a population are referred to as the ___
of that species
gene pool
in general, in sample of n individuals the frequency of an allele is
the number of occurrences of the allele divided by twice the number of individuals in the
sample (2n)
at the genetic level, evolution is
a change in the frequency of an allele or genotype over time
the differential success of alleles is called
selection
natural selection that increases the frequency of a favorable allele is called..
positive selection
the non-adaptive mechanism of evolutionary change are
migration, mutation and genetic drift
a hypothetical endangered species of wildflower has been reduced to a single
small population in a mountain meadow. a rare early spring blizzard kills all but 3
of the remaining plants, one of which has a rare mutation. this is an example of
genetic drift/bottleneck
when you use a field guide to identify a species by its appearances, you are
applying the
morphospecies concept
a population that exhibits any one allele at a particular gene is _____ for that
allele
fixed
which of the following is a condition of the hardy-weinberg equilibrium
random mating, no mutation, no migration, and no differences in the survival and
reproductive success of individuals
for species determination of a sexual organism, it is useful to use _____
ecological species concept and evolutionary species concept
unlike the biological species concept the morphospecies concept relies on ..
phenotype
a drawback of the biological species concept it that it cannot be applied to
extinct organisms
2 individuals are members of the same species if they
can produce fertile offspring
2 populations are the same species if they can successfully breed with each
other. true or false?
true
you are studying reproduction in a species of frog. two gametes that are diploid
join to form a viable zygote. if the F1 mates with one of the parents will there be a
viable offspring?
, no
horses and donkeys can interbreed, but their offspring (mules) are infertile. this is
an example of what kind of reproductive isolating mechanism
post-zygotic, genetic seperation
____ is the process by which diverging populations undergo natural selection in
favor of enhanced pre-zygotic isolation
reinforcement
___ is the process in which 2 groups of organisms living in the same habitat
diverge into seperate species
sympatric speciation
several species of fireflies are active on the same summer nights in the same
field. males and females recognized one another by their distinctive flashing
patterns. this is an example of what kind of reproductive isolation
pre-zygotic, behavioral isolation
which of the following characteristics of development is unique to animals
changes in cell postion
the major evolutionary split of bilaterian animals was based on _____
the developmental patterns
the advantages of the amniotic egg includes
the ability to result dessication in dry terrestrial habitats
a true coelom arises between layers of
mesoderm
comparative embryology helped clarify the relationships among major groups of
animals. the bilaterians, for example, can be divided into the _____ based on the
developmental fate of the blastopore
protostomes and duetrostomes
a close evolutionary relationship between annelids and mollusks is suggested by
the presence of a ____ in both phyla as well as by molecular sequence
companions
trochophore
cnidarians are able to capture prey with the aid of ___, harpoon-like organelles
that are often tipped with neurotoxins
cnidocyte
diploblastic organisms lack which germ layer
mesoderm
bilaterians develop specialized organs because they have
3 germ layers
cnidarians form the epithelial tissue.. true or false
true
___, such as sea squirts, share features of the chordate body plan during early
development
tunicates, cephalochordates
the ____ which includes the sharks, skates, and rays are unique in possessing
skeletons made of ___
chondrichtyes;cartilage
