Observe the three species of fruit fly and their evolutionary relationships in t
ID: 144534 • Letter: O
Question
Observe the three species of fruit fly and their evolutionary relationships in the tree below Fly species Fly species 2 Distant relative MRCA of fly species 1 & 2 Note that the three fly species have the following characteristics Fly species 1: white eyes, lots of leg bristles, striped wings Fly species 2 red eyes, lots of leg bristles, striped wings Distant relative: white eyes, lots of leg bristles, plain wings , what are the most likely characteristics of the most recent common ancestor (MRCA) of ny species , and ny species 2, labeled in the diagram above? Lots of leg bristles; can't tell on the other two traits Lots of leg bristles, striped wings; can't tell on eye color 0 Lots of leg bristles, striped wings, red eyes Lots of leg bristles, striped wings, white eyesExplanation / Answer
According to the question, the answer can be (3).Lots of bristled legs,striped wings and red eyes.
As we can see the two characteristics,i.e.,lots of bristled legs and striped wings are obeserved in both the fruit flies species 1 and species 2. By this, we can deduce that the two characteristics of the species are showing the linkage1 and are linked together in a chromosome,therefore,there are very high possibility that their progeny will have these two characteristics.
Also, the red eye characteristics shown by the the fruit fly species 2 is a X-linked dominant2 trait. Therefore, the red eye trait will also be passed on to their progeny.
Hence, we can conclude that the most likely characteristics of the most recent common ancestor(MRCA) of fly species 1 and fly species 2 is (3).Lots of leg bristles,striped wings and red eyes.
linkage1: phenomena in which different genes are physically associated on a chromosome.
X-linked dominant2: when the X-chromosome carries a dominant gene.
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