per season and males may fertilize the eggs of multiple females. Do you think that the sea bass are protandrous or protogynous? Explain your answer in terms of the evolutionary advantages of the strategy.
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- Which of the following observations is NOT an example of intra-sexual competition? Killing young individuals who are not oneâ s own offspring Guarding harem one has secured Having a specialized penile morphology that can displace other malesâ sperms Having a showy display to attract a mateIn the fish called the peacock wrasse (Symphodus tinca),females disperse some of their eggs widely and lay othereggs in a nest. Only the latter receive parental care. Explainthe trade-offs in reproduction that this behavior illustrates.Polygyny is a common mating system in nature. Which one of the following scenarios is LEAST likely to result in a polygynous mating system? Male stalk-eyed flies form leks where receptive females come visit Male Neotropical giant damselfly defend water-filled tree holes, which are the oviposition sites for females. Suitable tree holes for oviposition are rare and females must mate with the resident male in exchange for access to the oviposition sites. Male Bengal tigers defend large territories that contain food sources. Female Bengal tigers visit male territories to mate. The density of the Bengal tiger is extremely low that male tigers rarely encounter more than one female in their lifetime. In the bumblebee-wolf Philanthus bicinctus, females are unreceptive until they finish constructing the long underground burrow as nest sites. Males search for locations containing a number of newly constructed burrows and attempt to control these sites against the intruders. Your cousin Peter…
- What is Bateman's principle? Bateman's principle Lots of sperm Feweggs Sperm must compete over eggs Vria iepaduivesc ie mudigae in males tan in female The vane isame ete emity of sa elecion Males must compete overfemales Lots of sperm Feweggs A Terrnitoral males direct more courtship dispiays towards females that have shown up on their teritory for the first time compared to long term females companions. Males must maimce the number of mates Preferencefor "new females A single bird eggmay constitute 15-20% of female's body mass Lots of sperm Few eggs Females must maimize reproductive success per egg CS Scanned with CamScannerExplain the evolution of alternative male reproductive strategies within a single species. Give examples. nool deminerER What can less dominant males do? morebeemto lemates Compensatory mating strategies 1. Forming friehdships with a particular female (babbons). 2. Preejaculationfigienas). 3. Rape (ducks seorpionflies). 4. Satellite males ("parasitize successfulmales) Highand loakung mae s ors were found a have cs ofemales Du he hg arng mae had more cmso lesales during estr Nghe chance to produce Makingthe-best-of-a-bad-jab reproduotive strategy Conditional mating strategies: Co-existing reproductive strategies Genetic capacity for two altermative mating strategies (decision" is made during development, depending on nutrientavailability) Big horn, small testes OR Small horn, large testes Three different forms of sponge isopod males CS Scanned with CamScannerWhich of the following is NOT correct? O Most mammals have definite mating seasons. O Estrus is a short period of mammalian "heat." O All of the choices are correct. O The estrous cycle allows females to mate at any time of the year. O Many male mammals are capable of fertile copulation at any time.
- Secondary sexual characteristics or sexual often result from sexual selection? O dichotomy O hermaphrodites O monogamy O dimorphism A Moving to another question will save this response. escNuptial gift in crickets: duormous are male Understand the examples of species with sex-role reversal. Sex role reversal In some empid fies, the operational sex ratio is heavily female biased, because most males are off hunting for insect prey that is used as a nuptial gift When a male enters the swarm with a nuptial gift. he may find females advertising themselves with unusually large patterned wings, legs or abdomen. Is this always the case? m le diaclans Sex role reversal Sex role reversal Pipefish males have a brood pouch in which females lay their eggs. Provide nutnients and oxygen for a clutch of eggs for several weeks (male "pregnancy") Females compete formales. Males how more interest in feeding thanin mating. transfers to the female an spermatophore (-24% of the male's body mass). Males can only afford to mate orice. qpa cs Scanned with CamScannerCuckoo bird lays eggs in the nest of crowWhich type of interaction is shown in this relation?
- Because the reproductive success of female Hanuman langurs (Semnopithecus entellus) is almost certainly lowered when a newly installed male kills their young infants, selection should favor countermeasures against infanticidal males. In this light, why might already pregnant females mate with a new male soon after a takeover even though they are not ovulating? What significance do you attach to the discovery that when mares are impregnated by stallions at stables away from their home locations, they will also copulate repeatedly with the males in their home stables upon their return?In seahorses, males incubate and care for offspring. Thus, the males are more likely to be tied up in reproduction at any point in time relative to females. Which sex do you predict will be the choosey sex in this species and why? Males -- because fewer are available to mate Males – because male-male competition is incredibly strong Females – because sperm are cheap to produce Female – because the operational sex ratio is biased in their favor The sperm of chimpanzees have faster swimming speeds than those of gorillas. Based on what you know about sperm competition, what would you predict about differences between these two species in female re-mating frequency and sperm viability? In chimps, females mate only once and sperm are viable for only a day In chimps, females mate multiply and sperm live for a long time In chimps, females mate only one, and sperm live for a long time In chimps, females mate multiply, and sperm live for only a day Which of the following sexual traits is…"Skates and chimeras are oviparous, whereas rays and many sharks are viviparous. Being viviparous means that they _____." Have internal fertilization Have external fertilzation Give birth to live young Lay eggs