Biology 1201A Study Guide - Final Guide: Secondary Sex Characteristic, Parental Investment, Sexual Selection
Document Summary
Sexual selection results in differential reproductive success due to variation in mating success. Parental investment any parental expenditure (i. e. time and energy) that benefits one offspring at a cost to parents" ability to invest in other components of fitness. Ornaments a secondary sexual characteristic of an animal that appears to serve a decorative function rather than an ostensible function. They are used in displays to attract mates during sexual selection. Sexual dimorphism differences in the size or appearance of males and females. Sperm competition usually done through scrapers (scrape out sperm deposited by other males) or mating plugs (leave a plug after mating to prevent other males from mating) Parthenogenesis reproduction by female from unfertilized eggs (no sex is needed) Muller"s ratchet by chance, the part of the pop"n carrying the fewest deleterious mutations irreversibly goes extinct. Clonal interference adaptive mutations that emerge in different backgrounds cannot be combined in asexual popn"s.
