Genetics

Question 1

What is genetic drift?

Answer 1

stochastic changes in allele frequency due to chance

Question 2

What is positive selection?

Answer 2

Alleles with advantageous phenotype increase in frequency

Question 3

What is negative selection?

Answer 3

Alleles with deleterious effects decrease in frequency

Question 4

What are the 2 points from the neutral theory of molecular evolution?

Answer 4

1- Variation and divergence within species chiefly result of neutral mutations.
2- genetic drift drives molecular evolution

Question 5

What is the effect of population size on time taken for a neutral mutation to be fixed?

Answer 5

Larger population= longer for neutral mutation to be fixed

so higher genetic diversity

Question 6

What does the spread of selfish genes generally depend on?

Answer 6

mating system for outcrossing

Question 7

Why are suppressors not present fro small selfish gene driven deviations?

Answer 7

they are costly so only selected for when deviation is signifiant

Question 8

Give 3 reasons sex ratio drivers are selected against/suppressed

Answer 8

1) lower sperm success of mutated X
2) Y doesn’t want to be eliminated = selection for suppression
3) female bias increases male success