ASU BIO 182 EXAM 2 FREQUENTLY
TESTED ACTUAL QUESTIONS WITH
CORRECT ANSWERS
◉ What random processes cause genetic drift?.
Answer: -independent assortment of alleles
‑random variation in survival
‑random variation in mating success
‑random variation in fecundity
◉ Is fixation of a deleterious allele or the loss of a beneficial allele
more probable?.
Answer: Loss of a beneficial allele
◉ Fisher's Model.
Answer: Assume:
Each set of parents give birth to two offspring.
A new allele (a) arises, which has no effect on fitness
(fitness of Aa = fitness of AA).
, Fisher 1930,
The Genetical Theory of Natural Selection
Then:
Within each couple, there is a 25% chance the new
allele will be lost during reproduction.
◉ Genetic drift can...?.
Answer: -eliminate neutral alleles.
‑spread neutral alleles.
‑eliminate beneficial alleles
◉ The probability that a neutral allele will be fixed by genetic drift
equals...?.
Answer: the frequency of the allele
◉ What is critical thermal maximum?.
Answer: The max temp specific to the organism when said organism
can still perform functions necessary for survival
◉ What 3 conditions lead to genetic drift?.
Answer: -variation
‑heritability
TESTED ACTUAL QUESTIONS WITH
CORRECT ANSWERS
◉ What random processes cause genetic drift?.
Answer: -independent assortment of alleles
‑random variation in survival
‑random variation in mating success
‑random variation in fecundity
◉ Is fixation of a deleterious allele or the loss of a beneficial allele
more probable?.
Answer: Loss of a beneficial allele
◉ Fisher's Model.
Answer: Assume:
Each set of parents give birth to two offspring.
A new allele (a) arises, which has no effect on fitness
(fitness of Aa = fitness of AA).
, Fisher 1930,
The Genetical Theory of Natural Selection
Then:
Within each couple, there is a 25% chance the new
allele will be lost during reproduction.
◉ Genetic drift can...?.
Answer: -eliminate neutral alleles.
‑spread neutral alleles.
‑eliminate beneficial alleles
◉ The probability that a neutral allele will be fixed by genetic drift
equals...?.
Answer: the frequency of the allele
◉ What is critical thermal maximum?.
Answer: The max temp specific to the organism when said organism
can still perform functions necessary for survival
◉ What 3 conditions lead to genetic drift?.
Answer: -variation
‑heritability
