首页
登录
职称英语
[originaltext] I’ve mentioned how DNA have solved many mysteries in biology.
[originaltext] I’ve mentioned how DNA have solved many mysteries in biology.
游客
2024-01-04
24
管理
问题
I’ve mentioned how DNA have 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. Every winter some green turtles make a 2000 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, 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 question this explanation on the ground that it would be very unlikely that conditions would allowe 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’ve been genetically isolated long enough to have DNA that was very different from the green turtles that nest else where. But when scientists examine 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 this study was a nice example of the usefulness of DNA analysis to biology.
选项
A、Its geography is similar to Brazil’s.
B、Their instinct leads them to the place they were hatched.
C、There are other species of turtles located there.
D、Its climate is milder than Brazil’s.
答案
B
解析
According?to?one?hypothesis,?why?do?green?turtles?go?to?Ascension?Island?
转载请注明原文地址:https://tihaiku.com/zcyy/3332179.html
相关试题推荐
【11】[br]【18】[originaltext]Woman:Right,let’smoveontothebeacheshere
【11】[br]【17】[originaltext]Woman:Right,let’smoveontothebeacheshere
【11】[br]【16】[originaltext]Woman:Right,let’smoveontothebeacheshere
【11】[br]【13】[originaltext]Woman:Right,let’smoveontothebeacheshere
【1】[br]【9】[originaltext]Student:Goodmorning!Woman:Goodmorning-canIhel
【1】[br]【7】[originaltext]Student:Goodmorning!Woman:Goodmorning-canIhel
【1】[br]【6】[originaltext]Student:Goodmorning!Woman:Goodmorning-canIhel
【1】[br]【5】[originaltext]Student:Goodmorning!Woman:Goodmorning-canIhel
【1】[br]【4】[originaltext]Student:Goodmorning!Woman:Goodmorning-canIhel
【1】[br]【3】[originaltext]Student:Goodmorning!Woman:Goodmorning-canIhel
随机试题
Researchershaveestablishedthatwhenpeoplearementally【C1】______biochemi
NewwordsentertheEnglishlanguageallthetime.Infact,Englishhasalwa
Backintheday,agoodreportcardearnedyouaparentalpatontheback,b
下列能引起资产和所有者权益同时增加的业务有()。A.收到国家投资存入银行 B.
A.四逆汤合桃红四物汤 B.生脉散合血府逐瘀汤 C.六味地黄汤合补中益气汤
公开发行公司债券应当符合的条件之一是,股份有限公司的净资产不低于人民币()万元
Thechangeinthatvillagewasmiraculou
以募集方式设立公司,申请发行境内上市外资股的,发起人出资额应不少于1.5亿元人民
通风空调系统管安装时,矩形风管无法兰连接可采用的连接方式为()。A.立咬口
某企业有1台设备,目前的实际价值为38万元,预计残值为2.5万元,第1年的使用费
最新回复
(
0
)