首页
登录
职称英语
[originaltext]I’ve mentioned how DNA has solved many mysteries in biology. And
[originaltext]I’ve mentioned how DNA has solved many mysteries in biology. And
游客
2023-08-13
28
管理
问题
I’ve mentioned how DNA has solved many mysteries in biology. And today I want to talk about how it might relate to hypothesis about the travels of the green turtle. [23] Every winter some green turtles make a 2,000 km journey from Brazil to Ascension Island in the middle of Atlantic, where they mate and lay eggs. But the question is why do they travel so far to lay their eggs? One researcher hypothesized that there are two parts to the explanation. One is natal homing, [24] the instinct that drives green turtles to always return to the beach where they were hatched. The second part has to do with continental drift, the theory that the positions of earth continents have changed considerably overtime. Brazil and Ascension Island were once much closer together, and continental drift drove them apart. But the turtles kept on going back to the island where they hatched. However another scientist questioned this explanation on the grounds that it would be very unlikely that conditions would allow generations of turtles over hundreds of millions of years to keep going back to the same nesting ground every single year. So, what is the connection to DNA? Well, there are groups of green turtles that nest in locations other than the Ascension Island. If green turtles always return to the place where they were hatched, then the turtles that have been going to the Ascension Island to nest would have been genetically isolated long enough to have DNA that was very different from the green turtles that nest elsewhere. But when scientists examined DNA from these turtles, their DNA wasn’t that different from the DNA of the turtles that go to Ascension Island. Do you have a shock? Well, we still don’t know the answer to the question about why a certain group of turtles go to Ascension Island, but [25] this study was a nice example of the usefulness of DNA analysis to biology.
1.How far do some green turtles travel to lay their eggs?
2.What drives green turtles to return to the beach according to the theory of “natal homing”?
3.What is proved in this study?
选项
A、Climate.
B、Instinct.
C、Temperature.
D、Salinity.
答案
B
解析
转载请注明原文地址:https://tihaiku.com/zcyy/2923530.html
相关试题推荐
[originaltext]M:Here’smyjobapplication.W:Letmesee.Dowehaveallthei
[originaltext]W:Hello,Tom,couldyoupleasetellmesomethingaboutdrivingl
[originaltext]W:Hello,Tom,couldyoupleasetellmesomethingaboutdrivingl
[originaltext]Hello,everyone.Ifeelhappytobehere.Thereisanoldsay
[originaltext]Hello,everyone.Ifeelhappytobehere.Thereisanoldsay
[originaltext]Hello,everyone.Nicetomeetyouhere.Ifyouwanttobuild
[originaltext]Hello,everyone.Nicetomeetyouhere.Ifyouwanttobuild
[originaltext]Moderator:Hello,ladiesandgentlemen.Itgivesmegreatple
[originaltext]Moderator:Hello,ladiesandgentlemen.Itgivesmegreatple
[originaltext]Moderator:Hello,ladiesandgentlemen.Itgivesmegreatple
随机试题
WindEnergyWindenergydevelopmenthasbeenthr
[originaltext]M:Ifwedecidedtotaketheapartment,howsooncouldwemovein
Cancunmeans"snakepit"inthelocalMayanlanguage,anditliveduptoitsn
互联网出版中读者反馈的特点有( )等。A.反馈方式多种多样 B.互动性强
软件测试的对象不包括()。A.软件代码 B.软件文档 C.质量保证方法
能够从上述资料中推出的是:A.所有省区市医院诊疗人次数都超过乡镇卫生院诊疗人
Alport综合征最主要的遗传方式是A.常染色体隐性遗传 B.常染色体显性遗传
()允许期权买方在期权到期前的任何时间执行期权。A.美式期权 B.欧式期权
债券评级是债券评级机构对债券发行公司的()评定的等级。A.信用 B.利率
背景资料 某航道局承担某港3万吨级航道疏浚工程,采用1艘4500m3耙吸
最新回复
(
0
)