A fruit fly population has a gene with two alleles, A1 and A2. Tests show that 70% of
the gametes produced in the population contain the A1 allele. If the population is in
Hardy-Weinberg equilibrium, what proportion of the flies carry both A1 and A2?
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0.42
This type of sexual selection often results in results in glamorous male physical
characteristics such as bright colors, long tails, ornaments, and fancy dances
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intersexual selection
,produces exotoxins
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Vibrio cholerae, methanogen
Examples include the human coccyx and appendix, the remnants of eyes in blind
cave salamanders, and tiny hind limbs in transitional fossils of whale ancestors.
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vestigial structure
Assuming there are only two alleles at a given locus, if the frequency of one allele is
0.3, what is the frequency of the other allele?
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p + q = 1 ... so the frequency of the other allele in this case is 0.7
Identify at least four possible mechanisms for evolution based on situations that
violate the assumptions above
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, A. natural selection B. genetic drift C. gene flow D. artificial selection
In a hypothetical population of gazelles, 28 individuals are homozygous for the d2
allele, 72 individuals are heterozygous for the d2 allele, and 100 individuals lack the d2
allele. What is the frequency of the d2 allele?
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There are 28 x 2 "d2" alleles (in the homozygotes) plus 72 x 1 "d2" alleles in
the heterozygotes = 128 d2 alleles total, divided by the number of alleles at
this locus in the population [(28 + 72 + 100 individuals) x 2 alleles each] =
400 p = 128/400 or 0.32 or 32%
The four "ground" finches form a...
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The four "ground" finches form a...
Imagine that within a population over time, Hobbits with
large feet became common in a population while those with small feet became rare.
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directional selection
the gametes produced in the population contain the A1 allele. If the population is in
Hardy-Weinberg equilibrium, what proportion of the flies carry both A1 and A2?
Give this one a try later!
0.42
This type of sexual selection often results in results in glamorous male physical
characteristics such as bright colors, long tails, ornaments, and fancy dances
Give this one a try later!
intersexual selection
,produces exotoxins
Give this one a try later!
Vibrio cholerae, methanogen
Examples include the human coccyx and appendix, the remnants of eyes in blind
cave salamanders, and tiny hind limbs in transitional fossils of whale ancestors.
Give this one a try later!
vestigial structure
Assuming there are only two alleles at a given locus, if the frequency of one allele is
0.3, what is the frequency of the other allele?
Give this one a try later!
p + q = 1 ... so the frequency of the other allele in this case is 0.7
Identify at least four possible mechanisms for evolution based on situations that
violate the assumptions above
Give this one a try later!
, A. natural selection B. genetic drift C. gene flow D. artificial selection
In a hypothetical population of gazelles, 28 individuals are homozygous for the d2
allele, 72 individuals are heterozygous for the d2 allele, and 100 individuals lack the d2
allele. What is the frequency of the d2 allele?
Give this one a try later!
There are 28 x 2 "d2" alleles (in the homozygotes) plus 72 x 1 "d2" alleles in
the heterozygotes = 128 d2 alleles total, divided by the number of alleles at
this locus in the population [(28 + 72 + 100 individuals) x 2 alleles each] =
400 p = 128/400 or 0.32 or 32%
The four "ground" finches form a...
Give this one a try later!
The four "ground" finches form a...
Imagine that within a population over time, Hobbits with
large feet became common in a population while those with small feet became rare.
Give this one a try later!
directional selection
