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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.