KINDS OF NATURAL SELECTION

LECTURE 9

Selection

Response to selection is dependent on strength of selection which is dependent on difference in fitness values

Allele Frequencies

To calucate the allele frequencies of next generation we can use:

• (weighted fitness of XX carrying individual)/ (fitness of each genotype x genotype frequency)

• change = ((weighted fitness of XX carrying individual)/ (fitness of each genotype x genotype frequency) ) - X_t

Allele S

Allele S is an allele that is deletrious in the fact that is cause sickle cell amonia, which effects hemologbion cells when it comes to carrying oxygen throughout the body

• How S allele still remains in high frequency in areas of were cases of malaria is high as the S allele offers resteiant to malaria

P_Equilibrium

Equilibrium frequency due to balancing selectioning ( maintaing all allele frequencys present in population )

• P_Equilibrium = t/(s+ t)

Eviromental Heterogeneity

Varation in enviromental conditions