Midterm: Population Genetics

Question 1

Allele frequencies that are NOT evolving are called:

Answer 1

Hardy Weinberg equilibrium

Question 2

What 5 conditions must be present to show a population is in Hardy Equilibrium?

Answer 2

1. no apparent mutations
2. no natural selection (phenotypes to outperform others)
3. extremely large population size (no genetic drift)
4. no gene flow (introduction of new alleles)
5. random mating (no competition to mate, equal opportunity to mate)

Question 3

Hardy Weinberg Equilibrium determines:

Answer 3

that a population is likely evolving

Question 4

Gene pool:

Answer 4

all copies of every (or a specific) gene in a population

Question 5

If a % = Part/Whole, given the definition of allele frequency (% given allele in population), what should the denominator of this fraction be?

Answer 5

The total number of alleles contained in the individuals (e.g. 20 alleles total in the 10 individual plants)

Question 6

In a population of 100, how many CRCR, CRCW, and CWCW individuals would you observed if the population is NOT evolving?

Frequency of CR (16/20) = 0.8 = p
Frequency of CW (4/20)= 0.2 = q

use punnet square

Calculate with: 1 = p2 + pq + pq + q2

Answer 6

64 CRCR, 32 CRCW, 4 CWCW

Question 7

Hardy Weinberg Equation:

Answer 7

1 = p2 + pq + pq + q2

Question 8

What’s the difference between a genotype frequency and an allele frequency?

Answer 8

Allele freq: INDIVIDUAL allele relative to others
Genotype freq: distinct allele PAIRS in individuals relative to other pairs