BIO 200LLB Lecture Notes - Lecture 38: Five Hindrances, Storge, Kin Selection

• School: University at Buffalo
• Department: Biological Sciences
• Course: BIO 200LLB
• Professor: Herreid, C F

Document Summary

Parental love (care) increases survival of genes. Behaviours that encourage parental care increase their survival. Your siblings carry half of the same genes you carry. Reciprocal altruism in social organisms that live a long time and have good memories. Some lizard species have only one sex, females. Females produce eggs that spontaneously start development without sperm being involved at all. Fertilization doubles the number of chromosomes and meiosis cuts it in half. It doesn"t have to be that way. August weismann proposed an answer by asserting that sex increases genetic variation. When two different individuals mate by joining their gametes together, they produce a brand new genetic mixture and this promotes evolutionary adaptation. Mixing of the genes tends to break up favourable combinations. Asexual reproduction is twice as efficient as sexual reproduction at sending one"s gnees into the next generation.