BIOL 1004 Lecture Notes - Lecture 12: House Finch
6 Feb 2017
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Midterm on friday feb 10th: lectures 1-8, chapters 22-23 in textbook. Read through examples of situations from both notes and textbook. 10 practice questions posted on culearn with answers. Sexual selection has been talked about since darwin, who wrote an entire book called (cid:862)the des(cid:272)e(cid:374)t of. I(cid:374) ter(cid:373)s of sexual dimorphism, there are examples of these differences between sexes in both internal organs and observable features. Males (peacocks) have large, colourful tails that are used to attract females. However, the large tail and bright colours make the males less hidden to predators, which can lead to higher mortality rate. Intersexual selection: eg. traits that (cid:373)ales will use to displa(cid:455) to fe(cid:373)ales (cid:894)(cid:862)or(cid:374)a(cid:373)e(cid:374)ts(cid:863)(cid:895). Intrasexual selection: eg. when multiple males compete for a female, the males fight/compete for the chance to reproduce. The theory is due to the cost of producing gametes.
