The Carribean islands host -150 species of lizards from the Analis genus. These

Question

The Carribean islands host -150 species of lizards from the Analis genus. These lizards have been a classic example of evolution in action for biologists because they have undergone rapid reproductive isolation and speciation on different islands in different ways. The following figure shows two adaptive radiations on two different islands (Hispaniola and Jamaica), following colonization events by different types of species (Trunk crown vs. Twig colonizing species). (a) Species of vary in leg length and tail length. Some species are ground dwelling others live in distinct regions of shrubs of trees. (b) The same adaptive radiation Anolis has occurred on different islands, starting from different types of colonists. Why would a colonization event lead to rapid speciation (adaptive radiation) on these islands? On Jamaica, what term would you give to a clade that included the original colonizing common ancestor, the twig lineage, the trunk/ground lineage, and the Crown lineage? Why? Given the evolutionary history of the islands, does the "twig" phenotype on each islands represent divergent or convergent evolution (divergent = shared through common ancestry, convergent = independent evolution of superficially. similar traits). Why? what are two other mechanisms that can cause adaptive radiations? what do all three mechanisms that cause adaptive radiations to occur have in common?

Explanation / Answer

ques.1

colonisation is a process by which a speices spreads to new areas.

colonisation often refers to successful immigration where a population becomes integrated into a community, having resisted initial local extinction.

colonisation as a factor of speciation

geographic isolation most often occurs with population that are completely saperated by a physical barrier( leads to immigration) such as mountain range , river or desert .

the separated populations adapt to their own unique environment becoming so genetically different from one another that members of one population cannot breed with members of the other.

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.