BIO 1130 Lecture Notes - Lecture 5: Sperm Competition, Gananoque, Standard Deviation

• School: University of Ottawa
• Department: Biology
• Course: BIO 1130
• Professor: Jon Houseman

Document Summary

No genetic drift population is large. Sickle cell anemia cell does not load o2 as well, killing parasite of malaria. This allows people with sickle cell anemia to survive malaria better. For this reason, a high incidence of sickle cell anemia is seen in areas w/ malaria. Malaria is one of the three top killers in the world. Need to indicate if selecting for or against a trait. Mean is kept at same location, standard deviation is tightened. When there is a drought, plants do not set seed so they can focus on own survival. When drought came, two generations later finches had already responded. Finches use beaks to crack seed direct relationship b/w size of beak and size of seed. Intermediate beak length disappeared, began selecting for big or small beak. Three years later drought ended, full distribution of beak sizes came back. No, all the same alleles are there; just shuffled differently.