NATS 1840 Chapter 9: 9.2- Reproductive Patterns and Survival
8 Feb 2019
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Asexual reproduction: all offspring are genetic copies of their single parent (bacteria) Sexual reproduction: offspring is produced by combining gametes (sperm, ovum) from two parents, offspring has a combination of genetic traits from each parent. Males cannot give birth, increased chance of genetic errors during splitting and recombination of chromosomes. Mating consumes time and energy, disease can be transmitted, competition for mates. Males can help protect young and gather food. Reproductive patterns most of their energy for reproduction. (algae,bacteria), little or no parental care. R-selected species: capacity for high rate of population increase, reproduce early, use. Opportunists: reproduce and disperse rapidly when conditions are favourable. Environmental changes can causes crashes in population. K-selected species (competitors): reproduce late in life, small number of offspring with long life spans. Strong offspring that can compete for resources and begin cycle again. (bears, humans)
