Chapter 8 flashcards _ Quizlet

Co n v erg en tev o lu tio n can o ccu r o n ly wh en

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Unformatted text preview: trace o f an o rg an ism fro m th e p ast. Marsu p ial mammals: Au stralia is an islan d , th e lack o f p lacen tal mammals b ein g in tro d u ced allo wed fo r marsu p ials to main tain a wid er ran g e o f n ich es with less co mp etitio n . Also , DNA an aly sis sh o ws a clo ser relatio n sh ip with th e marsu p ial g ro u p th at o u tsid e it. Co n v erg en t ev o lu tio n can o ccu r o n ly wh en two sp ecies: are b o th u n p alatab le to p red ato rs. It is th e en v iro n men t th at selects fo r a trait th at d ev elo p s fro m a ran d o m ch an g e in DNA. Sectio n 8 .1 9 Wh at can b e co n clu d ed ab o u t co mp arin g d ifferen ces in mo lecu lar b io lo g y b etween d ifferen t sp ecies? Gen etic seq u en ces are altered at a co n stan t rate after lin eag es sep arate; th e alteratio n s an d d ifferen ces can b e u sed to d ed u ce h o w lo n g it's b een sin ce th ey sep arated , an d th u s h o w clo sely lin eag es an d sp ecies are related to each o th er. Sectio n 8 .2 0 Ev o lu tio n is resp o n sib le fo r th e in...
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