PCB 4674 Lecture Notes - Lecture 18: Selective Breeding
3 Dec 2016
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Document Summary
Wilkinson and reillo (1994: part one: randomly collected wild flies and from these they established three lab populations. 1) random females x random males (control) 2) random females x extra long stalked males. 3) random females x extra short stalked males: after 13 generations. Each population was significantly unique in eye stalk length: part two: assay female preference, one cage with two chambers separated by clear plexiglass wall. One long stalk male and one short stalk male: results. Females in both the control population and the long stalk population preferred long stalks. Females in the short stalk population preferred short stalks. Thus, when researchers artificially selected for short stalks in males. Female preference for short stalks evolved along with the evolution of shorter stalks. Tatus of the (cid:862)null(cid:863) model: both empirical examples presented could be explained in other ways as well. Discovery of any other process at work could rule out the null model as the sole explanation.
