BIOLOGY 1104 FINAL EXAM
QUESTIONS AND ANSWERS
What is a species? - Correct Answers -A group of similar organisms that can breed and
produce fertile offspring.
What keeps biological species separate? - Correct Answers --No gene flow (no
production of viable offspring)
-reproductive barriers
What is a prezygotic barrier? - Correct Answers -individuals are physically incapable of
mating or the male sperm can not fertilize the female egg
What is a postzygotic barrier? - Correct Answers -A barrier that acts after fertilization to
prevent the formation of viable and fertile offspring.
shortcoming of biological species concept - Correct Answers --classifying asexual
reproduction
-classifying fossil species
-determining when one species changes into another
-classifying hybridizing species
what are two ways to determine a species? - Correct Answers -Biological species
concept or
Morphological species concept (used most commonly)
What problems come with morphological species concept? - Correct Answers -Different
biological species can appear very similar, so they can be classified the same but in
reality cannot mate with each other
There can be LOTS of variation within a single species so they might look very different
like humans but are able to mate
How does speciation happen? - Correct Answers -geographic isolation and reproductive
isolation
What is allopatric speciation? - Correct Answers -a physical barrier divides one
population into two or more populations (geographical isolation)
, Different environments in the different locations select for different traits, eventually
causing morphologicaldifferences and reproductive barriers between the populations
When does speciation occur? - Correct Answers -when populations of the same species
become reproductively isolated
What is sympatric speciation? - Correct Answers -the process through which new
species evolve from a single ancestral species while inhabiting the same geographic
region
NO ISOLATION COMMON IN PLANTS- they contain more than 2 sets of
chromosomes.
In sympatric speciation can the offspring mate with original diploid? - Correct Answers -
NO, it can only mate with other mutated offspring
What do evolutionary trees show? - Correct Answers -Common ancestors and
relationships between species
The more recent the common ancestor, the more closely related the two species -
therefore, the more characteristics they're likely to share
what are the four major groups of gymnosperms - Correct Answers -conifers, ginkos,
gnetophytes, cycads
do gymnosperms have flowers - Correct Answers -no, cone like structures responsible
for majority of pollen season
what are the biggest adaptations of plants - Correct Answers -seeds and pollen (male
gametes)
What is a monoplyletic group? - Correct Answers -Members of a monophyletic group
share a common ancestor, and the group contains all of the descendants of that
ancestor.
Monophyletic describes any group in which all of the individuals are more closely
related to each other than to any individual outside of that group.
what do we look at when constructing evolutionary trees? - Correct Answers -molecular
sequences
What did Darwin propose? - Correct Answers -natural selection as a mechanism for
evolution
Darwin proposed that species can change over time, that new species come from pre-
existing species, and that all species share a common ancestor.
QUESTIONS AND ANSWERS
What is a species? - Correct Answers -A group of similar organisms that can breed and
produce fertile offspring.
What keeps biological species separate? - Correct Answers --No gene flow (no
production of viable offspring)
-reproductive barriers
What is a prezygotic barrier? - Correct Answers -individuals are physically incapable of
mating or the male sperm can not fertilize the female egg
What is a postzygotic barrier? - Correct Answers -A barrier that acts after fertilization to
prevent the formation of viable and fertile offspring.
shortcoming of biological species concept - Correct Answers --classifying asexual
reproduction
-classifying fossil species
-determining when one species changes into another
-classifying hybridizing species
what are two ways to determine a species? - Correct Answers -Biological species
concept or
Morphological species concept (used most commonly)
What problems come with morphological species concept? - Correct Answers -Different
biological species can appear very similar, so they can be classified the same but in
reality cannot mate with each other
There can be LOTS of variation within a single species so they might look very different
like humans but are able to mate
How does speciation happen? - Correct Answers -geographic isolation and reproductive
isolation
What is allopatric speciation? - Correct Answers -a physical barrier divides one
population into two or more populations (geographical isolation)
, Different environments in the different locations select for different traits, eventually
causing morphologicaldifferences and reproductive barriers between the populations
When does speciation occur? - Correct Answers -when populations of the same species
become reproductively isolated
What is sympatric speciation? - Correct Answers -the process through which new
species evolve from a single ancestral species while inhabiting the same geographic
region
NO ISOLATION COMMON IN PLANTS- they contain more than 2 sets of
chromosomes.
In sympatric speciation can the offspring mate with original diploid? - Correct Answers -
NO, it can only mate with other mutated offspring
What do evolutionary trees show? - Correct Answers -Common ancestors and
relationships between species
The more recent the common ancestor, the more closely related the two species -
therefore, the more characteristics they're likely to share
what are the four major groups of gymnosperms - Correct Answers -conifers, ginkos,
gnetophytes, cycads
do gymnosperms have flowers - Correct Answers -no, cone like structures responsible
for majority of pollen season
what are the biggest adaptations of plants - Correct Answers -seeds and pollen (male
gametes)
What is a monoplyletic group? - Correct Answers -Members of a monophyletic group
share a common ancestor, and the group contains all of the descendants of that
ancestor.
Monophyletic describes any group in which all of the individuals are more closely
related to each other than to any individual outside of that group.
what do we look at when constructing evolutionary trees? - Correct Answers -molecular
sequences
What did Darwin propose? - Correct Answers -natural selection as a mechanism for
evolution
Darwin proposed that species can change over time, that new species come from pre-
existing species, and that all species share a common ancestor.
