[Campbell Biology P.771] Based on the provided text, how many Hox genes are typically found ... | Practice Question

Based on the provided text, how many Hox genes are typically found in tunicates, lancelets, and vertebrates, respectively?

  • A: Tunicates: 9, Lancelets: 13, Vertebrates: 13
  • B: Tunicates: 9, Lancelets: 13, Vertebrates: 2 or more sets of 13
  • C: Tunicates: 13, Lancelets: 9, Vertebrates: 2 or more sets of 13
  • D: Tunicates: 13, Lancelets: 13, Vertebrates: 13

Explanation

The text states that 'tunicates have nine Hox genes, whereas all other chordates studied to date—including the early-diverging lancelets—share a set of 13 Hox genes.' It further specifies that 'vertebrates possess two or more sets of Hox genes lancelets and tunicates have only one ' due to gene duplication. Therefore, the correct counts are Tunicates: 9, Lancelets: 13, Vertebrates: 2 or more sets of 13.