BIOB51 ANDRADE EXAM QUESTIONS AND
ANSWERS WITH COMPLETE SOLUTIONS VERIFIED
Negative Frequency dependent selection
fitness of genotype depends on frequency in the population
se;ection favours first one allele then the other
the rarer allele shows fitness increase
the more common allel the fitness decreases
it has an equillibrium point that both alleles come back to
mantians genetic diversity
heterozygote superioirty or overdominance
the heterozygote have the highest fitness
clue: the alele freqquenc is constant
heterozygotes have higher frequency in H-W model
Mantains genetic diversity
One Allele favoured
, leads to fixation of favoured allele and loss of the other alelle, the frequency would be 1
of the fixed and the lost is 0
expected pattern on selection on deleterios alleles
Heterozygote inferiority underdominance
the heterozygote is inferior
leads to the fixation of one allele and loss of another
it does both mantain genetic diversity and reduce genetic diversity, among they
mantain, within they lose
Scale Eating cichlids
case of negatrive frequency dependanet selection
2 types
right handed
attacks left side of victim
left handed fish
attacks right side fo victim
Physiological constraint
1st hypotesis for testes size among promates, larger testes for higher need of
testosterone
Sperm Competition
competition among the sperm of differnet males for the fertilization of the eggs of a
single female
Evolutionary hypothesis
testes size is an evolutionary response to sperm competition
ANSWERS WITH COMPLETE SOLUTIONS VERIFIED
Negative Frequency dependent selection
fitness of genotype depends on frequency in the population
se;ection favours first one allele then the other
the rarer allele shows fitness increase
the more common allel the fitness decreases
it has an equillibrium point that both alleles come back to
mantians genetic diversity
heterozygote superioirty or overdominance
the heterozygote have the highest fitness
clue: the alele freqquenc is constant
heterozygotes have higher frequency in H-W model
Mantains genetic diversity
One Allele favoured
, leads to fixation of favoured allele and loss of the other alelle, the frequency would be 1
of the fixed and the lost is 0
expected pattern on selection on deleterios alleles
Heterozygote inferiority underdominance
the heterozygote is inferior
leads to the fixation of one allele and loss of another
it does both mantain genetic diversity and reduce genetic diversity, among they
mantain, within they lose
Scale Eating cichlids
case of negatrive frequency dependanet selection
2 types
right handed
attacks left side of victim
left handed fish
attacks right side fo victim
Physiological constraint
1st hypotesis for testes size among promates, larger testes for higher need of
testosterone
Sperm Competition
competition among the sperm of differnet males for the fertilization of the eggs of a
single female
Evolutionary hypothesis
testes size is an evolutionary response to sperm competition
