Worksheet 3 - assignment on species and speciation PDF

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assignment on species and speciation ...

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Worksheet 3 – Species and Speciation Question 1 Using the Biological Species concept, how would you determine if one mouse population from New Mexico is the same species as a mouse population in California? Answer: One way is if they are able to reproduce and have offspring they are considered to be same populations.

Question 2 Donkeys and horses can mate and produce mules, which are infertile. Using the biological species concept, explain whether horses and donkeys are the same species or not. Answer: So they are not the same species as at some point the genetics will be so different that when they mate they will produce an infertile offspring.

Question 3

The key to BSC is reproductive isolation. Can you separate these cases into prezygotic or postzygotic mechanisms? What do the postzygotic have in common? Temporal isolation Hybrid inviability Gamete isolation Hybrid sterility Behavioral isolation Mechanistic isolation Hybrid breakdown Habitat isolation Mating seasons

Answer: Prezygotic : temporal isolation, gamete isolation, behavioral isolation, mechanistic isolation, habitat isolation, mating seasons. Postzygotic: Hybrid inviability, hybrid sterility, hybrid breakdown

Question 4 Ratites contain flightless birds on many continents, such as Ostrich, Emu, Kiwi and more. If they share a common ancestor, how do you think they evolved on different continents?

Answer: I think its on how they species got there to begin with, they are adapting to a new environment. So we can see they flouring into new species by adaption to its new area....