Biology 1M03 Midterm1
QUESTIONS AND VERIFIED
CORRECT ANSWERS
GRADED A+ LATEST 100%
GUARANTEED PASS
what does natural selection rely on? - CORRECT ANSWER-- variation
- heritability
- fitness
- competition
explain what happened in the mycobacterium TB bacteria - CORRECT ANSWER-antibiotics gave
rise to a resistant population because of a small mutation in RNA gene rpoB; in normal
conditions this mutation wouldn't survive but the antibiotics switched the case
gene that influences beak size expression - CORRECT ANSWER-Bmp4
candidate study - CORRECT ANSWER-using an accessible species to study the molecular basis
for a selection in a target species that is not as easy to access/test
,artifical selection - CORRECT ANSWER-humans alter course of evolution but purposely selecting
traits
what influences speed/degree of artificial selection? - CORRECT ANSWER-how many times its
repeated, how many traits the animal has, and # of constraints
unintended artificial selection - CORRECT ANSWER-does not benefit humans or nature and is a
direct consequence of human activity
examples of unintended artifical selection - CORRECT ANSWER-large horned sheep; smaller cod
typical result of artificial selection - CORRECT ANSWER-smaller size, time of maturation,
behaviour
why does unintended artificial selection result in this? - CORRECT ANSWER-humans go after the
strongest and best in a population whereas natural selection is the opposite
what is the purpose of hardy weinberg? - CORRECT ANSWER-to analyze allele frequencies and
apply it to make predictions about a population
what are the 4 factors that influence allele frequency? - CORRECT ANSWER-- natural selection
- genetic drift
- gene flow
- mutation
what does hardy weinberg assume? - CORRECT ANSWER-assumes that allele frequencies are
not changing over time
, what are the steps to test for HWE? - CORRECT ANSWER-analyze genotype frequencies; analyze
allele frequences; estimate expected frequnecies; compare expected with observed
if a population is in HWE what does that mean - CORRECT ANSWER-there's no proof its in HWE
you just fail to reject it; it means that none of the 4 factors are acting on the population
directional pattern of natural selectin - CORRECT ANSWER-one extreme genotype is favoured
stabilizing pattern of natural selection - CORRECT ANSWER-intermediate (heterozygous)
phenotype is favoured; reduces variation in the extremes
disuptive pattern of natural selection - CORRECT ANSWER-favours both extreme genotypes and
reduces variation of the intermediate
negative frequency dependant pattern of natural selection - CORRECT ANSWER-rare
phenotypes in a population are favoured
positive frequency dependant pattern of natural selection - CORRECT ANSWER-common
phenotypes in a population are favoured
genetic drift - CORRECT ANSWER-random change in allele frequency; is unbiased and non
adaptive
fixation outcome of genetic drift - CORRECT ANSWER-trait that was polymorphic is now present
in every individual
extinction outcome of genetic drift - CORRECT ANSWER-new allele appears and then goes
extinct over an infinite amount of time
QUESTIONS AND VERIFIED
CORRECT ANSWERS
GRADED A+ LATEST 100%
GUARANTEED PASS
what does natural selection rely on? - CORRECT ANSWER-- variation
- heritability
- fitness
- competition
explain what happened in the mycobacterium TB bacteria - CORRECT ANSWER-antibiotics gave
rise to a resistant population because of a small mutation in RNA gene rpoB; in normal
conditions this mutation wouldn't survive but the antibiotics switched the case
gene that influences beak size expression - CORRECT ANSWER-Bmp4
candidate study - CORRECT ANSWER-using an accessible species to study the molecular basis
for a selection in a target species that is not as easy to access/test
,artifical selection - CORRECT ANSWER-humans alter course of evolution but purposely selecting
traits
what influences speed/degree of artificial selection? - CORRECT ANSWER-how many times its
repeated, how many traits the animal has, and # of constraints
unintended artificial selection - CORRECT ANSWER-does not benefit humans or nature and is a
direct consequence of human activity
examples of unintended artifical selection - CORRECT ANSWER-large horned sheep; smaller cod
typical result of artificial selection - CORRECT ANSWER-smaller size, time of maturation,
behaviour
why does unintended artificial selection result in this? - CORRECT ANSWER-humans go after the
strongest and best in a population whereas natural selection is the opposite
what is the purpose of hardy weinberg? - CORRECT ANSWER-to analyze allele frequencies and
apply it to make predictions about a population
what are the 4 factors that influence allele frequency? - CORRECT ANSWER-- natural selection
- genetic drift
- gene flow
- mutation
what does hardy weinberg assume? - CORRECT ANSWER-assumes that allele frequencies are
not changing over time
, what are the steps to test for HWE? - CORRECT ANSWER-analyze genotype frequencies; analyze
allele frequences; estimate expected frequnecies; compare expected with observed
if a population is in HWE what does that mean - CORRECT ANSWER-there's no proof its in HWE
you just fail to reject it; it means that none of the 4 factors are acting on the population
directional pattern of natural selectin - CORRECT ANSWER-one extreme genotype is favoured
stabilizing pattern of natural selection - CORRECT ANSWER-intermediate (heterozygous)
phenotype is favoured; reduces variation in the extremes
disuptive pattern of natural selection - CORRECT ANSWER-favours both extreme genotypes and
reduces variation of the intermediate
negative frequency dependant pattern of natural selection - CORRECT ANSWER-rare
phenotypes in a population are favoured
positive frequency dependant pattern of natural selection - CORRECT ANSWER-common
phenotypes in a population are favoured
genetic drift - CORRECT ANSWER-random change in allele frequency; is unbiased and non
adaptive
fixation outcome of genetic drift - CORRECT ANSWER-trait that was polymorphic is now present
in every individual
extinction outcome of genetic drift - CORRECT ANSWER-new allele appears and then goes
extinct over an infinite amount of time
