Hardy Weinberg. Hardy Weinberg refers to Populations

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Transcript of Hardy Weinberg. Hardy Weinberg refers to Populations

  • Slide 1
  • Hardy Weinberg
  • Slide 2
  • Hardy Weinberg refers to Populations
  • Slide 3
  • Slide 4
  • Slide 5
  • Hardy Weinberg Equilibrium What it is? A way to measure evolution in a population Allele frequency will not change from generation to generation if a population is not evolving.
  • Slide 6
  • These are your alleles Genotype? Bb
  • Slide 7
  • Slide 8
  • Slide 9
  • Phenotype? What is the allele frequency in the room?
  • Slide 10
  • Lets set up a data table to record our allele frequencies.
  • Slide 11
  • Lets Reproduce... Meiosis Anyone? Then into the gene pool This is more like spawning
  • Slide 12
  • What is our new allele frequency?
  • Slide 13
  • 1. Natural Selection 2. Calculate survivor allele frequency 3. SURVIVORS only...Reproduce 4. Next generation
  • Slide 14
  • H-W Equilibrium says Allele Frequency will remain the same from generation to generation... DID IT?
  • Slide 15
  • Oh Wait... Hardy Weinberg Conditions 1. No mutation 2. Random Mating 3. Large Population 4. No Natural Selection 5. No emigration/immigration
  • Slide 16
  • Science Practice 1 The student can use representations and models to communicate scientific phenomena and solve scientific problems. Model : Reproductive isolation.
  • Slide 17
  • Model: genetic drift Model: non-random mating Model: mutation Model: emigration/immigration
  • Slide 18
  • How do we use the H-W Formula? p 2 + 2pq + q 2 = 1
  • Slide 19
  • 19 Hardy-Weinberg describes the status quo and provides a way to describe change. 5 conditions must be met: Allele frequencies wont change if 1. The population is large 2. Mating is random 3. There is no mutation 4. No immigration or emigration 5. There is no selection
  • Slide 20
  • 20 All the alleles in a population must equal 100% Say A and a are the alleles at a locus Diploid organisms have 2 loci p = the frequency of A q = the frequency of a So the frequency of p + q must equal 100% or 1.0
  • Slide 21
  • 21 Frequency of possible combinations of p and q for diploid organisms (p+q) (p+q) =(p+q) (p+q) = p 2 + 2pq + q 2
  • Slide 22
  • In a population of 1000 individuals, 360 of the individuals have an attached earlobe, a recessive trait. This population is in Hardy Weinberg equilibrium. How many individual are heterozygous for this trait?
  • Slide 23
  • Scotland has the highest percentage of redheads in the world at 13%. Assuming Hardy Weinberg equilibrium, calculate the frequency of p and q.