L26 Population genetics: variation in space and time

Description

• Calculate genotype frequencies using Hardy-Weinberg equilibrium. • Identify that random genetic drift occurs rapidly in small populations. • Explain how populations evolve over time in response to selection.
Mer Scott
Quiz by Mer Scott, updated more than 1 year ago
Mer Scott
Created by Mer Scott over 7 years ago
10
1

Resource summary

Question 1

Question
Allele frequencies in a [blank_start]population[blank_end] remain [blank_start]constant[blank_end] over time unless acted upon by evolutionary [blank_start]forces[blank_end].
Answer
  • population
  • constant
  • forces

Question 2

Question
Which of these is not an assumption of the Hardy-Weinberg equilibrium?
Answer
  • Large population size
  • No natural selection
  • No mating
  • No mutations
  • No migration

Question 3

Question
The frequency of alleles can be calculated by:
Answer
  • p + q = 100
  • p + q = 1
  • p^2 + 2pq + q^2 = 1
  • p^2 + pq + q^2 = 100

Question 4

Question
The genotypic frequency can be calculated by:
Answer
  • p^2 + pq + q^2 = 1
  • pq^2 + 2pq + q^2 = 1
  • p^2 + 2pq + q^2 = 1
  • p1^2 + p + q = 1

Question 5

Question
1 in 2500 children are born with the recessive disease cystic fribrosis. What proportion of the population are carriers of this disease?
Answer
  • 0.0004
  • 0.02
  • 0.98
  • 0.0392

Question 6

Question
Genetic drift is a change in allele [blank_start]frequencies[blank_end] due to random, [blank_start]non[blank_end] natural selection events.
Answer
  • frequencies
  • non

Question 7

Question
Stabilising selection [blank_start]reduces[blank_end] variation but [blank_start]doesn't[blank_end] change the mean. Directional selection [blank_start]changes[blank_end] the mean value toward an [blank_start]extreme[blank_end]. Disruptive selection [blank_start]favours[blank_end] the two extremes, and often leads to [blank_start]speciation[blank_end].
Answer
  • reduces
  • increases
  • doesn't
  • extreme
  • changes
  • favours
  • speciation
  • extinction
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