Morphologically, Species A is very similar to four other species, B-E. Yet the nucleotide sequence deep within an intron in a gene shared by all five of these eukaryotic species is quite different in Species A compared to that of the other four species when one studies the nucleotides present at each position.
Figure 26.4
-If the sequence of Species A differs from that of the other four species due to simple misalignment, then what should the computer software find when it compares the sequence of Species A to those of the other four species?
A)The nucleotide at position 1 should be different in Species A, but the same in species B-E.
B)The nucleotide sequence of Species A should have long sequences that are nearly identical to those of the other species, but offset in terms of position number.
C)The sequences of species B-E, though different from that of Species A, should be identical to each other, without exception.
D)If the software compares, not nucleotide sequence, but rather the amino acid sequence of the actual protein product, then the amino acid sequences of species B-E should be similar to each other, but very different from that of Species A.
E)Computer software is useless in determining sequences of introns; it can only be used with exons.

Question

Morphologically, Species A is very similar to four other species, B-E. Yet the nucleotide sequence deep within an intron in a gene shared by all five of these eukaryotic species is quite different in Species A compared to that of the other four species when one studies the nucleotides present at each position.
  Figure 26.4
-If the sequence of Species A differs from that of the other four species due to simple misalignment, then what should the computer software find when it compares the sequence of Species A to those of the other four species?
A)The nucleotide at position 1 should be different in Species A, but the same in species B-E. 
B)The nucleotide sequence of Species A should have long sequences that are nearly identical to those of the other species, but offset in terms of position number. 
C)The sequences of species B-E, though different from that of Species A, should be identical to each other, without exception. 
D)If the software compares, not nucleotide sequence, but rather the amino acid sequence of the actual protein product, then the amino acid sequences of species B-E should be similar to each other, but very different from that of Species A. 
E)Computer software is useless in determining sequences of introns; it can only be used with exons.

Quizplus · Accepted Answer

If the differences in the intron sequence of Species A compared to the other four species was due to misalignment, computer software would find long sequences that are nearly identical but offset in terms of position number. This is because the software aligns sequences based on similarity, so similar sequences would be matched up despite their differences in position. Option A and C do not account for the possibility of misalignment. Option D refers to comparing amino acid sequences, which is not mentioned in the question. Option E is incorrect; computer software can be used to determine sequences of introns.

Morphologically, Species a Is Very Similar to Four Other Species