Flashcards in Lecture 21 Deck (41)
What were the findings of the Milinski study?
Females reliably preferred males with the largest
number of MHC alleles
In runaway selection, a relationship exists between what?
alleles that code for a
male trait and female preference for that specific trait
What happens when the preference/trait association is set in motion?
The effect will become exaggerated over generations
Males will develop an amplified version of the
originally preferred trait
Females will apply stronger selection pressures for the
Female stalk eye flies prefer males with _______ eye stalks.
What two test conditions were created in the stalk eye experiment?
Males with the longest eye stalks were allowed to breed
Males with the shortest eye stalks were allowed to breed
Females were selected randomly for the two treatments
What were the results in the long stalk eye condition?
had increasingly long eye stalks and the converse was true in the short eye-stalk condition
When females of the subsequent generation of short eye stalks were given free choice of mates, what happened?
they selected males
from their experimental condition (preference has to exist in females)
Cluttonbrock studies male-male competition in red deer. What are the findings?
Male stags compete to
23% of harem holders show signs of fighting injury
6% are permanently injured
Male red deer use what to help judge fighting ability?
bouts of roaring
When is roaring seen?
almost exclusively during mating season.