Unformatted text preview: was low)? 1 2/13/2013
-Very sexually dimorphic genes were the MOST sensitive to this
e arly, temporary low food condition
-Short term food deprivation results in long term gene->protein>phenotype effects
Is the transcriptome condition- dependent? 100s of new genes are recruited into the dimorphic state -Does the transcription of genes->proteins (the ones
t hat mediate dimorphism) depend on conditions?
• Whole adult tissue
• 14K D. melanogaster genes. -Dimorphism in gene expression across the board increases
w hen the environment is good
-Brief stress decreases this across-the-board dimorphism Sex-biased genes become more sex-biased Are the gonads driving the majority of the conditiondependence seen in sex-biased genes? NO!! -The more dimorphic genes were more sensitive to nutrition -The testes are not any more condition sensitive
t han all the OTHER sex-biased genes!!
-All biased genes overall are condition sensitive (Below): Further, the Dud male results in a lower
q uality offspring that will not express the
q ualities that a female is looking for
Can female preference remove
Adapted pop #1:
high cadmium Good genes: sexual selection removes
“bad genes” Adapted pop #2:
low cadmium Females identify “stud” and “dud” males
Studs and duds father offspring X "GOOD"
Test population Non-mating fitness of offspring assayed
Repeated in 3 independently derived
??? Penelope Gorton Stud
Dud Sexy males produce healthy offspring
Tested in high cadmium -Can the female "see" bad genes through condition-dependent
t rait expression? -Studs consistently produced female offspring that laid
more eggs than duds did in 3 separate populations
-Clearly "sexy" males DO produce healthier offspring
-(There is some rhyme and reason to the display of sexually
-CAN THE FEMALE SENSE THIS "Sexy Stud = Better Offsp"
relationship? 2 2/13/2013 Sexual and natural selection are
congruent in adapting weevil populations Are sexual and natural selection are
congruent in adapting populations Populations evolve on “old” or nove...
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- Winter '14
- Annotated Lecture S, Sexual Selection, Sexual dimorphism, sexually antagonistic traits