97_09_LB_PopGen1

# 97_09_LB_PopGen1 - Bio 97 Population/Gene Pool Population...

This preview shows pages 1–4. Sign up to view the full content.

1 Population Genetics I ©1999-2007 Lee Bardwell Bio 97 Population/Gene Pool Population = group of organisms of the same species living in the same geographical area Gene pool = all alleles in population ©1999 Lee Bardwell Genotype frequency = proportion of individuals in a population with a specific genotype Allele frequency = proportion of alleles in a population ©1999 Lee Bardwell We’d like to know… Relationship between allele frequencies and genotype frequencies How to predict what AF’s and GF’s will be in future generations We need a theory

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
2 Developed a simple mathematical model of the transmission of alleles from generation to generation To understand this model you need to know: 1 X 1 = 1 1 X a = a Simple high-school algebra One gene (Arrogance), 2 alleles A (dominant allele) a (recessive allele) Genotype Phenotype AA, Aa arrogant aa humble ©2005 Lee Bardwell Hardy-Weinberg Equation p = frequency of allele A (dominant allele) q = a (recessive allele) Example - Gene pool with 700 A and 300 a alleles. p = A/(A+a) = 700/(700+300) = 0.7 q = a/(A+a) = 300/(700+300) = 0.3 ©2005 Lee Bardwell or wild-type { One gene, 2 alleles Allele freqs NOTE : p + q = 1 If we know the allele freqs in a given generation And we assume random mating Then we can calculate the genotype freqs in the next generation
3 A population mates p 2 AA a Female gametes Male gametes ©1999 Lee Bardwell A A q p a p q pq Aa q 2 aa pq Aa (p+q) 2 = p 2 +2pq+q 2 = 1 Genotype freq. of aa genotype

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 9

97_09_LB_PopGen1 - Bio 97 Population/Gene Pool Population...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online