Read How

How did Giraffes Get Long Necks



This topic How did Giraffes Get Long Necks has not been written yet, if you would like to write about How did Giraffes Get Long Necks you may do so here.



Similar Questions for How did Giraffes Get Long Necks from Yahoo Answers

Question
How come giraffes have long necks that allow them to eat leaves high in the trees?Explain please.?
Today,giraffes have long necks that allow them to eat leaves high in the trees.They got longer necks by stretching up for leaves.They passed the trait of long neck to their offspring. the offspring stretched up for even higher leaves. After many generations, the giraffe's neck was really long. Do you think this explanation for how the giraffe's neck got long is right? Explain.

Answer
I don't think it's quite right. Giraffes have long necks simply because their neck bones are much bigger (they actually have the same number of neck bones as humans). Just by stretching the muscles of the neck, even constantly, isn't likely to cause bigger neck bones or pass on bigger neck bones to your offspring. I think the answer is that whatever mutation caused bigger bones in the neck allowed those particular giraffes to keep well fed and thereby reproduce to pass on the bigger-neck-bone genes.



Question
How is natural selection in the evolution of long necks in giraffes best explained?
A. Shorter-necked giraffes were killed by long-necked giraffes B. Giraffe necks grew longer because of the bone structure of the animals C. Giraffes with longer necks survived because they were better suited to the environment D. Long-necked giraffes mated only with other long-necked giraffes.

Answer
C. Giraffes with longer necks survived because they were better suited to the environment. According to Lamarck theory of inheritance of acquired character, the ancestor of giraffe were horse like lived in africa having enough grass & herbage to eat,when they forced to graze upon leaves of trees,thus by continuous effort of stretching the neck & forelimb increased in each generation to reach this food.



Question
How did Lamarck explain the long neck of a giraffe?
A.Giraffes always had long necks. B.Only giraffes that eat from the top of trees need long necks. C.Giraffes used to have short necks but the use of their necks made them grow. D.Giraffes used to have short necks and suddenly grew long necks. E.Baby giraffes may be born with short necks or may be born with long necks.

Answer
C. Lamarck thought that giraffes would pass on acquired characteristics. He had the right idea that previous generations passed on genes, but a giraffe stretching its neck would not be passed on to the giraffe's offspring. An evolutionary change would take a much longer time than that.




Join  | Login