Question

species x has a gene a that has this as part of its sequence:
atgctgcctagc
which species is most closely related to species x, based on their gene a sequence?
○ species a: atgctccatgcg
○ species d: attctgcctagc
○ species b: tacctggcaagt
○ species c: atgccttccctgg

Explanation:

The most closely related species has the gene sequence with the fewest differences from Species X's sequence (ATGCTGCCCTAGC). Species D differs by only 1 nucleotide (first T vs A), while others have more differences. Closely related organisms share more similar DNA sequences.

Answer:

D. Species D: ATTCTGCCCTAGC