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
12
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、To discover how long their ancestors lived.
B、To analyze how their appearance has evolved.
C、To find out how a disease has spread
D、To determine how closely groups of turtles are related.
答案
D
解析
How?is?DNA?used?in?the research?on?green?turtles?
转载请注明原文地址:https://tihaiku.com/zcyy/3332180.html
相关试题推荐
[img]2022m3x/ct_ve01202001m_eillist_0947_220329[/img][br][originaltext](Ethan
[img]2022m3x/ct_ve01202001m_eillist_0947_220329[/img][br][originaltext](Ethan
[img]2022m3x/ct_ve01202001m_eillist_0947_220329[/img][br][originaltext](Ethan
[img]2022m3x/ct_ve01202001m_eillist_0947_220329[/img][br][originaltext](Ethan
[img]2022m3x/ct_ve01202001m_eillist_1293_220329[/img][br][originaltext]Lastly
[img]2022m3x/ct_ve01202001m_eillist_1293_220329[/img][br][originaltext]Lastly
[img]2022m3x/ct_ve01202001m_eillist_0540_220329[/img][br][originaltext]Hello
[img]2022m3x/ct_ve01202001m_eillist_0540_220329[/img][br][originaltext]Hello
[img]2022m3x/ct_ve01202001m_eillist_0540_220329[/img][br][originaltext]Hello
[img]2022m3x/ct_ve01202001m_eillist_0540_220329[/img][br][originaltext]Hello
随机试题
CharlesR.DrewwasamedicalstudentatColumbiaUniversityinNewYork.Be
[originaltext]W:I’dliketoreturnthisnovel,andI’msorrytosaysomepages
金融企业组织制度的建立需要遵循()的原则A.市场配置原则 B.主体效益原
下列关于横道图的特点说法错误的是( )。A.容易看出工作之间的相互依赖.相互制约
美国在文件管理中一般称私人文件管理为手稿管理。()
《测绘作业人员安全规范》规定,野外测绘人员在人烟稀少的地区或是林区、草原区作业时
安全工器具室(柜)宜具有温度、湿度监控功能,满足温度为()、相对湿度为80
某商业区设置一条长度200m的有顶棚的步行街,下列关于步行街的设置,不符合规
某交易者买入1手5月份执行价格为670美分/蒲式耳的小麦看涨期权,支付权利金18
患者,男,35岁,因急性阑尾炎穿孔,行阑尾切除手术后5天,仍有腹胀、腹痛,体温3
最新回复
(
0
)