A small population of deer living on an isolated island is sep...

Question

A small population of deer living on an isolated island is separated for many generations from a mainland deer population. The populations retain the same number of chromosomes but hybrids are infertile. One chromosome (shown here) has a different banding pattern in the island population than in the mainland population.

Comparison of chromosome banding patterns between mainland and island deer populations, highlighting differences in hybrid viability.

Suppose that 40% of all meioses in mainland–island hybrids involve recombination somewhere in the chromosome region between q2.1 and p2. What proportion of the gametes of hybrid deer are viable? What is the cause of the decreased proportion of viable gametes in hybrids relative to the parental populations?

Accepted Answer

Hey, everyone. Let's take a look at this question. Together, bats and birds evolved wings independently from each other, but they share similar functional adaptations for flight such as lightweight bones and aerodynamic shapes. This is an example of what is it? Answer choice. A divergent evolution, answer choice B, convergent evolution. Answer choice C parallel evolution or answer choice D genetic drift. Let's work this problem out together to try to figure out which of the following answer choices is the correct answer. So we know that we have bats and birds that evolved wings independently from each other. So we have our bats and we have our birds who both evolved independently from each other, but share those similar functional adaptations for light. So they have their light adaptations. And since these two species who are not closely related to each other and evolved independently, but both evolved to achieve those adaptations in flight, it means that the evolution of both bats and birds converged. So that means that bats and birds evolving wings independently from each other but sharing similar functional adaptations for flight describes convergent evolution, which is Answer choice B, since convergent evolution is a process of organisms who are not closely related. In this case, the bats and the birds evolving independently but gaining similar functional adaptations such as flight adaptations, which are those lightweight bones and aerodynamic shapes. I hope you found this video to be helpful. Thank you and goodbye.

Key Concepts

Meiosis and Gamete Formation

Hybrid Incompatibility

Chromosomal Banding Patterns

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