Biology 1201A Lecture Notes - Lecture 2: Parental Investment
Document Summary
Sexual selelection (november 9 t h, november 14 t h) Differential reproductive success due to variation in mating success: no (cid:271)a(cid:271)ies if you (cid:272)a(cid:374)"t fi(cid:374)d so(cid:373)eo(cid:374)e to (cid:373)ate (cid:449)ith. Reduced fitness because individuals (genotypes) fail to reproduce due to competition, choice with individuals of their own species. Reduced fitness because individuals (genotypes) fail to survive and reproduce. Fe(cid:373)ales (cid:272)hoose (cid:373)ates (cid:271)ased o(cid:374) (cid:862)displays(cid:863) a(cid:374)d physi(cid:272)al traits: sexes interact, elaborate courtship displays/ calls, ornamentation, males (cid:272)o(cid:373)pete to gai(cid:374) a fe(cid:373)ale"s atte(cid:374)tio(cid:374) Intrasexual selection individuals of one sex compete amongst themselves: Males monopolize access to females: outcompete rivals, direct control of females, control of a resource important to females. Some organisms sneak in and mate quickly without the dominant male noticing. Scrapers: scrape out sperm deposited by other males. Mating plugs: after mating, leave a plug to prevent other males from mating. Favours any gene, anatomical structure, or behaviour that provides a reproductive advantage.
