The instructor never taught the class how to solve this question. Not only the a

Question

The instructor never taught the class how to solve this question.

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Inversion of DNA sequences within chromosomes is a common process in evolution. The following gene arrangements in a particular chromosome are found in four different species. 1 MNOPQR 2 ROPMNO 3 MNRQPO 4 MPQRNO Assuming that the arrangement in 1 is the original arrangement, in what evolutionary order did the four species arise, such that there is only one inversion between each species. (Place number 1 first in your ordering.)

Explanation / Answer

This is a logical question. Answer is 1-3-4-2

The orginal arrangement 1 = MNOPQR

INVERSION is nothing but rearrangement in which a segment of a chromosome is reversed.

Here OPQR GETS REVERSED TO RQPO

The sequence becomes has MNRQPO - 3

From this sequence MNRQPO, the NRQP IS inversed to PQRN. So the chromosome becomes MPQRNO -4

Then the chromosome MPQRNO, MPQR is inversed to RQPM. THE CHROMOSOME NOW becomes RQPMNO. - 2

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