Secondary Occurring after Primary effects Different production of y chromosome

Secondary occurring after primary effects different

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Secondary: Occurring after Primary effects:Different production of y- chromosome bearing spermDifferential; uptake of y- chromosome bearing spermHormone mediated effectsTestosterone and Estrogen
September 9, 2019OverproductionSexual conflict-strategies to reproduce are different within each sex to maximize the mot reproductive success-evolutionary pressures that lead to conflict -evolution favours maximizing reproductive successCompetition for females can lead to sexual size dimorphismMatin systems and parental care in birds and mammalsMammals: Internal gestation, lactation-over 90% of species are polygynous-male parental care is rareBirds?-egss must be incubated, chicks must be fed (in most species)-over 90% of species are monogamous-male parental Parental Investment Theory (trivers) (chapter 2)-the sex that provides the most parental investment (that’s going to be the choosysex)-not anisogamy, but ParentalParental Investment is not parental care. (GOING TO BE EXAM)-any effort by a parent to increase the chances of survival of an existing offspring at the expense of the parent’s ability to produce future offspring -parental investment involves a trade-off between current and future offspring -*females always have a higher investment-most males are not limited in producing offspring because they don’t take care ofoffspring (not focused on what you’re doing for the offspring, that’s parental care)Male fish can do parental investment as they take care of the eggsInvests in today’s offspring so that they can produce more offspring in the future
September 9, 2019Whereas the females can go and produce more offspring and not provide parentalcare -females can lead to assertive mating -which means that males with specific characteristics (the ones females prefer) will be more likely to mate than males without those characteristics What’s important to females when choosing a maleMIDTERM ANSWERS -direct benefits (to her) resources, territoryIndirect benefits (genetic benefits) – fitter offspring (get better genes)What are good genes?Define Inclusive Fitness-measure of relative evolutionary success for genotype (reproductive success, survival, fecundity), including the direct fitness of the individual as well as indirect fitness-fitness of other with shared genes (relatives).2)Provide an example **rest on your iphone**October 25, 2019Females produce the most costly gametes (in most species [fishes, birds not uncluded]For most mammals, they have costly gametes**PARENTAL INVESTMENTS ARE NOT THE SAME THING AS PARENTAL CARE*Anything you do to produce future offspring, increasing their chances of survivalWhat is parental care? Whats the difference between those 2?
September 9, 2019Why are females choosy? How did this evolution occur?

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