BIOS 242 week 8 final Exam Question with Correct Answers Graded the Highest A++
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Course
Biology
Institution
Biology
**** important fact !!! adaptations are driven by coevolution and interspecific interactions -
CORRECT ANSWER --
1. formation of new alleles
- new alleles arise by mutation, a change in the nucleotide sequence of DNA
- only mutations in cells that produce gametes can be passed to offspring
...
Answers Graded the Highest A++
**** important fact !!! adaptations are driven by coevolution and interspecific interactions -
CORRECT ANSWER ✔✔ --
1. formation of new alleles
- new alleles arise by mutation, a change in the nucleotide sequence of DNA
- only mutations in cells that produce gametes can be passed to offspring
-0 a point mutation is a change in a single nucleotide in a DNA sequence - CORRECT
ANSWER ✔✔ -- Somatic mutations does NOT matter
- Gametic Mutation does matter
1. no mutations - CORRECT ANSWER ✔✔ -- the gene pool is modified if mutations occur or if
entire genes are deleted or duplicated
,mutations themselves will not change the whole population, you need the acting of natural
selection
no evolution= no mutation
- rates of mutation are generally too low to cause evolution by itself
- instead, mutations are an important source of variation that may be acted upon by natural
selection
1. the connection between genotype, phenotype and evolution of species
- natural selection sorts phenotypes and selects for the advantageous phenotypes that must be
heritable in order to be passed down in further generations
2. the role of the population in evolution
- individuals themselves do NOT evolve, it happens are the Population level
3. how do we measure evolutionary change over generations?
- allele frequency changes passed on to following generations
,4. whether natural selection is the only force to cause populations to evolve
- NO ; also gene flow and genetic drift are other factors
5. why only natural selection can drive adaptive evolution?
- deterministic and predictable that will cause changes to happen in the population
6. the different forms of natural selection
- stabilizing
-disruptive
-directional
7. why sexual selection often works differently on males and females?
- difference in - CORRECT ANSWER ✔✔ --
2 main examples of genetic drift
bottleneck effect
- reduce pop. size and try to restore it
, founder effect
- isolated population on an island so you see inbreeding - CORRECT ANSWER ✔✔ --
2 modes of speciations
1. allopatric speciation : geographic isolation via dispersal or vicariance
dispersal: movement of individuals across barriers
- established a new population, isolated, there is a break
- founder effect can then be seen on this isolated population like the study in loss of eyesight
vicariance isolation: (geographic isolation without dispersal)
-encroaching physical feature such as a river, glacier, lava flow, or new habitat
- environmental cause can cause separation
-ex. rise of glaciers gives rise to a barrier that separates the species ; another example is a rise in
mountain ranges
- "different-country"
- different geographical regions
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