a) Each subspecies of seaside sparrow has arestricted range. (b) The six subspec

Question

a) Each subspecies of seaside sparrow has arestricted range. (b) The six subspecies form two monophyletic group when DNA sequences are compared manitima mgrescens Atiantic Coast Between regions about 1%ofthe DNA sequences differ Within each region DNA sequences are virtualy identical seaside Gulf Coast How does the discovery of a past geological event that divided a once-continuous salt marsh in Florida support the tree depicted? See Section 24.2 (Page 486) It supports the concept of allopatric speciation via vicariance. It supports the concept of allopatric speciation via dispersal. C It does not support the tree depicted because the DNA sequence difference between the species is only I percent. It does not support the tree depicted because there are six groups, not two

Explanation / Answer

The geological event that divided once a continuous salt marsh in florida is an allopatric even. Allopatric speciation occurs when a single species gets isolated/divided from each other due any geographical even such as formation of mountain, river, valley etc. When separated, each group starts to develop new and distinct traits. If the separation has occurred a very long ago then there exists a more pronounced difference amongst the groups. Allopatric speciation can happen by VICARIANCE where a natural geographical cause physically divide the population. Whereas, in the case of Allopatric speciation via DISPERSAL few members of the species migrate from one geographical are to another resulting in the difference over time. But they are not different species say like Homo sapiens and Homo erectus . They are just on different geographical locations and it gets even clear when it says that there is only 1% genetic difference. Recent studies shows that these close relatives can be mated together to give an offspring under conservation plan of these species. And we know that two species can be defined only when they can mate together to give rise to an offspring similar to them. So, here also same can happen. Thus it doesn’t describe speciation over time. They are not genetically different enough to be classified into different species. Answer is the third option.

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