For the following questions, please circle the single best answer . Select only ONE answer per question. Michael Moore investigated the role of testosterone in territorial behavior of spiny lizards by castrating males and then manipulating the levels of testosterone by injections. Selection on behavioral characters is much slower than selection on morphological characters due to pleiotropy. Selecting for one character can lead to concordant change in other characters due to pleiotropy.
Domesticity has an important environmental component due to epistasis.
Jerry Wilkinson uses artificial selection in order to modify the eye stalk length in male stalk-eyed flies. Females always prefer longer-stalked males, but natural selection sets upper limits on the stalk length. Females prefer to mate with males like the ones that raised them. Females show correlated changes in preference for males in the same direction as the artificial selection due to linkage disequilibrium. Females show correlated changes in preference for males by matching their own eyestalk length to that in the males.