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2024 BIOLOGY 1108 UNIT 1 EXAM WITH CORRECT ANSWERS
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2024 BIOLOGY 1108 UNIT 1EXAM WITH CORRECT
ANSWERS
The term "n" refers to the size of a population, that is, the number of
individuals in that population. In general, in a sample of n individuals, the
frequency of an allele is:
A)the number of occurrences of the allele.
B)the number of occurrences of the allele divided by n.
C)the actual value of n
D)the number of occurrences of the allele divided by twice the number of
individuals in the sample (2n).
E)twice the number of occurrences of the allele divided by n. - CORRECT
ANSWERS-D)the number of occurrences of the allele divided by twice the
number of individuals in the sample (2n).
gap junctions - CORRECT ANSWERS-protein channels that allow ions and
signaling molecules to move from one cell into another.
plasmodesmata - CORRECT ANSWERS-intracellular strands of cytoplasm that
extend to neighboring cells allowing the same type of cell communication
Cells having different cell fates - CORRECT ANSWERS-depending on which
genes are switched off or on
- Genes turning on or off depend on the molecular signals
- "Molecular signals" are the environmental cues of the developing organism
The oldest fossils that record complex multicellularity occur in rocks that
were deposited - CORRECT ANSWERS-575−555 million years ago.
have more complex characters (head, tail, top, bottom, left, right). and they
were moving (animal tree was beginning to branch
If a population is not in Hardy-Weinberg equilibrium, we can conclude that:
,A)evolution has occurred.
B)natural selection has occurred.
C)one of the assumptions of the Hardy-Weinberg equilibrium has been
violated.
D)evolution has occurred because one of the assumptions of the Hardy-
Weinberg equilibrium has been violated. - CORRECT ANSWERS-D)evolution
has occurred because one of the assumptions of the Hardy-Weinberg
equilibrium has been violated.
The larvae are prey of both parasitoid wasps and birds. Wasps selectively
prey on larvae inside the smallest galls while birds selectively prey on larvae
inside the largest galls. The size of the gall made by the larvae is a heritable
trait. Given this information, we can conclude that the trait 'larval gall size' is
subject to:
A)balancing selection.
B)stabilizing selection.
C)directional selection.
D)disruptional selection.
E)heterozygote advantage. - CORRECT ANSWERS-B)stabilizing selection.
You find that a wild population of antelope is not in Hardy-Weinberg
Equilibrium. From this information alone, can you determine the mechanism
of evolution operating on the population?
A)Yes
B)No - CORRECT ANSWERS-B)No
A population with a novel adaptation has evolved that adaptation.
A)False, but only if the population is under sexual selection
B)True
C)True, but only if the population is under sexual selection
D)False - CORRECT ANSWERS-B)True
, The peppered moth provides a well-known example of natural selection. The
light-colored form of the moth was predominant in England before the
industrial revolution. In the mid-nineteenth century, a dark-colored form
appeared. The difference is produced by a dominant allele of one gene. By
about 1900, approximately 90% of the moths around industrial areas were
dark colored, whereas light-colored moths were still abundant elsewhere.
Apparently, birds could readily find the light moths against the soot-
darkened background in industrial areas and therefore were eating more
light moths. Recently, use of cleaner fuels has greatly reduced soot in the
landscape, and the dark-colored moths have been disappearing. Should the
two forms of moths be considered separate species?
A)Yes, because they have completely different coloration.
B)Yes, because they are reproductively isolated based on habitat.
C)No
D)Yes, because they - CORRECT ANSWERS-C)No
Three populations of crickets look very similar, but the males have courtship
songs that sound different. What function would this difference in song likely
serve if the populations came in contact?
A)a prezygotic isolating mechanism
B)a postzygotic isolating mechanism
C)a spatial/geographic reproductive isolating mechanism
D)a gametic reproductive isolating mechanism
E)none of the above - CORRECT ANSWERS-A)a prezygotic isolating
mechanism
How are two different species most likely to evolve from one ancestral
species?
A)phylogenetically, due to heterozygote advantage in hybrids
B)sympatrically, due to extensive inbreeding
C)sympatrically, by a point mutation affecting morphology or behavior
D)allopatrically, due to extensive inbreeding
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