Ivy and Sakaluk (2005) studied the potential benefits of polyandry in decorated
ID: 219022 • Letter: I
Question
Ivy and Sakaluk (2005) studied the potential benefits of polyandry in decorated crickets. Their experimental design involved the following treatments:(a) Single mated females(b) Three times mated to same male(c) Three times mated to different maleThey measured offspring number and offspring survival for each treatment.How does this experimental design allow the researchers to test if increased genetic diversity among offspring is a benefit of polyandry in this system (include predictions of this hypothesis)?
Explanation / Answer
Ivy and Sakalul measured offspring number and offspring survival for these three treatments-a) Single mated females,b) Three times mated to same male and c) Three times mated to different male.
Null hypothesis-There is no increased genetic diversity due to polyandry
Alternate hypothesis-There is increased genetic diversity due to polyandry.
Multiple mating appears to provide significant fitness benefits to females, but these benefits become evident only when females mate polyandrously. Females mating polyandrously produced significantly more offspring surviving to adulthood than did either once-mated females or females mating monogamously. Multiple matings resulted in enhanced female fitness relative to single matings when females mated with different partners, but not when females mated repeatedly with the same male. Specifically, polyandrous females produced significantly more offspring surviving to reproductive maturity than did monogamous females mating once or mating repeatedly with the same male.For that reason, it can be concluded that this increased individual survival and fitness due to genetic diversity is a benefit of polyandry in this system.
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