If You Know That a Hox Gene, AbdB, Is Expressed

question 120

Multiple Choice

If you know that a Hox gene, AbdB, is expressed in the most posterior part of the abdomen in a Drosophila embryo, which of the following conclusions about a homologous gene in humans would most likely be correct?

• A) There is no homologous gene to abdB in humans, because the evolutionary distance between humans and flies is so great.
• B) The homologous gene to abdB exists in humans, but it is expressed only in adults, not in human embryos.
• C) The homologous gene to abdB exists and is expressed in the head of human embryos.
• D) The homologous gene to abdB exists and is expressed throughout the human embryo in roughly equal amounts.
• E) The homologous gene to abdB exists and is expressed near the tail of the human embryo.

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