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
2024-04-01
27
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、DNA can solve all the mysteries in biology.
B、The DNA of two groups of green turtles are totally different.
C、The useless of DNA analysis to biology.
D、The usefulness of DNA analysis to biology.
答案
D
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3536377.html
相关试题推荐
[originaltext]Optimismandpessimismrepresentyourgeneralattitudetowardcer
[originaltext]W:Rockstarsnowfaceanewhazard—voiceabuse.[5]Afterlastw
[originaltext]W:Rockstarsnowfaceanewhazard—voiceabuse.[5]Afterlastw
[originaltext]W:Hi,Iunderstandthatthereareaerobicclassesforstudentsa
[originaltext]I’vementionedhowDNAhassolvedmanymysteriesinbiology.And
[originaltext]Nowwe’vebeentalkingabouttherevolutionaryperiodintheUnit
[originaltext]Nowwe’vebeentalkingabouttherevolutionaryperiodintheUnit
[originaltext]Nowwe’vebeentalkingabouttherevolutionaryperiodintheUnit
[originaltext]I’dliketolookatavitalaspectofe-commerce,andthatisthe
[originaltext]I’dliketolookatavitalaspectofe-commerce,andthatisthe
随机试题
【B1】[br]【B5】[originaltext]It’snevertooearlytosaveyourskin—oryour
Sportsisoneoftheworld’slargestindustries,andmostathletesareprofe
下列有关给水工程的说法中,哪几项不正确?()A.给水系统的水质必须符合国家现
目前演出市场综艺晚会等组台演出很多,关于其排练制作,以下说法错误的是()。
大宗商品衍生工具不包括( )。A.远期合约 B.期货合约 C.期权合约
下列选项中,应当计入生产成本的是()。A.制造费用 B.销售费用 C.管理
(2017年真题)在期货市场上,结算部门的职能是提供交易设施。()
在决定上大学的合理年限是,决策的基本依据是上大学的()。A.平均成本等于平均收
合同法律关系包含的要素有( )。A.主体 B.内容 C.法律规范 D.法律
男,54岁。20天内呕血2次,每次呕血之后大便发黑。乙肝病史30年。贫血貌,浅表
最新回复
(
0
)