Question

molecular evidence: using the dna sequences shown, which organisms are the most closely related? human: aat - gca - tac - gga - tga - cat - tta dog: aat - gga - ttt - gaa - tga - caa - cta chimpanzee: aat - gga - tac - gga - tga - cat - tta fly: att - aca - tat - cgc - cgt - cat - tta mushroom: att - aaa - tat - cca - aaa - caa - cta dog and fly human and chimpanzee mushroom and fly human and dog

Explanation:

To determine which organisms are most closely related, compare their DNA sequences. The more similar the sequences, the closer the relationship.

• Human: AAT - GCA - TAC - GGA - TGA - CAT - TTA
• Dog: AAT - GGA - TTT - GAA - TGA - CAA - CTA
• Chimpanzee: AAT - GGA - TAC - GGA - TGA - CAT - TTA
• Fly: ATT - ACA - TAT - CGC - CGT - CAT - TTA
• Mushroom: ATT - AAA - TAT - CCA - AAA - CAA - CTA

Compare each pair:

• Human and Chimpanzee:
• The second segment: Human has GCA, Chimpanzee has GGA (1 difference)
• The third segment: Both have TAC (0 difference)
• The fourth segment: Both have GGA (0 difference)
• Overall, they have more matching segments compared to other pairs.

Answer:

Human and Chimpanzee