BIOS 230 Lecture Notes - Lecture 16: Asexual Reproduction, Sexual Reproduction, Zygote
Document Summary
Fitness: reproductive success, genetic representation in future generations. Reproductive trade-offs: costs associated with reproduction, reduce probability of future survival, number of brood and ability to defencd. Individuals have limited resources: physiological, energetics, environmental constraints. Life history: lifetime pattern of growth, development and reproduction. Sexual vs. asexual reproduction, costs and benefits: sexual reproduction: fusion of egg and sperm into zygote, recombination of chromosomes. Parents contribute half their genes, specialized reproductive organs. Expense not shared between parents: asexual reproduction: no fertilization, offspring genetically identical to parent. Pros: offspring are adapted to current conditions. May be unable to adapt to environmental change. Matings systems and how environmental factors influence them: pattern of mating between males and females in a population, females have more to lose, more selective(phenotype and resource provider, resource availability, distribution and defensibility. Monogamy: when resources are distributed evenly: formation of lasting bond between 1 male and 1 female, parents cooperate to raise child.
