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
2023-08-12
16
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://www.tihaiku.com/zcyy/2920758.html
相关试题推荐
[originaltext]Goodmorning,class.Beforewebegintoday,Iwouldliketoa
[originaltext]Goodmorning,class.Beforewebegintoday,Iwouldliketoa
[originaltext]Inancienttimes,manypeoplebelievedtheearthwasaflatd
[originaltext]Itmayseemstrangethatwe’rediscussingmusicfromaBroad
[originaltext]Thankyouallforcomingtomytalkthisevening.It’snice
[originaltext]Xwasasecretagent.Hehadrentedafurnishedroominapro
[originaltext]Xwasasecretagent.Hehadrentedafurnishedroominapro
[originaltext]M:Howdidyoufindthisjob?W:Well,IknewtheshopbecauseI
[originaltext]M:Howdidyoufindthisjob?W:Well,IknewtheshopbecauseI
[originaltext]M:Howdidyoufindthisjob?W:Well,IknewtheshopbecauseI
随机试题
在(),需要让员工在团队中建立起信任感。A.组建期 B.风暴期 C.
下列各项中,不符合资产会计要素定义的是()。A:委托代销商品B:委托加工物资
患者,女性,30岁。3个月前体检时发现上腹包块,近半年出现上腹部胀满感,轻微压痛
膀胱恶性肿瘤最常见的症状是A.排尿困难 B.尿频、尿急、尿痛 C.腹部肿块
患者夜寐盗汗,五心烦热,两颧色红,口渴,舌红少苔,脉细数。治疗应首选A.黄连阿胶
( )主管全国的教师工作。A.国务院教育行政部门 B.教育部 C.人民代表
社会工作者运用“此时此地”的技术让组员表达自己的感受,接纳他人的感受。特别是对沉
在开立证券帐户的基本原则中,()是指只有国家法律允许进行证券交易的自然人和法人才
竞争指个体或群体充分实现自身的潜能,力争按优胜标准使自己的成绩超过对手的适度竞争
产品的寿命周期成本由产品生产成本和()组成。A、使用及维护成本 B、使用成本
最新回复
(
0
)