Reproduction :: essays research papers

For some time she had watched his movements,appearing coyly in his haunts. And now, had it remunerative off? Doubtless, he was in love. His muscleswere taut he swooped through the transmit to a greater extent likean eagle than a Greylag gander. The notwithstanding businesswas, it was not for her that he then landed in a flimflam of quacks and wingbeats, or for her that hedashed off surprise attacks on his fellows. It was,rather, for other - for her preening rival acrossthe Bavarian lake. Poor goose. Will she mate withthe gander of her dreams? Or will she trail him foryears, laying infertile egg clutches as proof of herfaithfulness? Either outcome is possible in an fauna world marked daily by scenes of courtship,spurning and love triumphant. And take blood theseare not the imaginings of some Disney screen-16writer. Decades ago Konrad Lorenz, a famedAustrian inbornist, made detailed studies ofGreylags and afterwards showed no hesitation in using words like love, grief and evenem barrassment to describe the sort of theselarge, social birds. At the same time he did not close up that all romance - animal and human - is tiedintimately to natural selection. Natural selectionbrought on the evolution of males and femalesduring prehistoric epochs when environmental throw was making life difficult for single-sexspecies much(prenominal) as bacteria and algae. Generally,these reproduced by splitting into identical copiesof themselves. New generations were thus nobetter than ageing ones at surviving in an alteredworld. With the emergence of the sexes, however,youngsters acquired the qualities of two parents.This meant that they were diverse from both -different and perhaps better at coping with touchwoodproblems of survival. At the same time, nature hadto furnish a new determined of instincts which would make"parents" out of such unreflective entities asmollusks and jellyfish.. The peacocks splendidfeathers, the fireflys flash, the kyphosis whalesresound ing bellow - all are means these animalshave evolved to pursue natures command "Find amate. Transmit your characteristics through time" scarce while most males would accept indiscriminatemating, females generally have more on theirminds. In most species, after all, they take onreproductions hardest chores such as carryingyoung, incubating eggs and tending newborns.Often they can produce only a few young in alifetime. (Given half a chance, most males wouldspawn thousands.) So its no surprising that theladies are choosy. They necessity to match theircharacteristics with those of a successful mate. Hemay flap his fly or join a hockey team, butsomehow he must show that his offspring will notlikely be last to eat or first in predatory jaws.