Question

-TU- 5. Female swordtail fish prefer to mate with males that have long tails. Males of closely related platyfish species do not have swordtails, but females of this species prefer to mate with males that do have swords. A plausible explanation for the evolution of swordtails is a. Long tails were costly to produce but provided an inclusive fitness benefit b. Long tailed males had higher survivorship because predators could not swallow their long tail c. Males with longer tails exploited the female preference and gained greater mating success d. Long tails provide an honest indicator of male quality 6. Storm petrels only lay a single egg during a breeding attempt. Storm petrel chicks beg less when they have just been fed. Why might they do this? a. Out of altruism, to conserve food for other breeding petrel pairs b. Out of altruism, to increase the future success of their siblings c. Out of spite, to decrease both their own and their parents future reproductive success d. Out of selfishness, to conserve food for later 7. Hamilton's rule shows how to calculate the costs and benefits of helping relatives. Hamilton's rule is- a. cx rc>b x rb b. bx rc<c x rb c. bx rc = c x rb d. cx rc<b x rb

Answer 1

5 correct option is A) male having long tail have to invest more energy to maintain and hence better survival chances due to much higher production of energy and hence better survival fitness

6) b option correct as out of altruism cause future sibling to succes which sacrifice their need so that other can also get food

7.d option correct as benefit should always be more compared to coat for altruism