Homeotic Genes Contain a Homeobox Sequence That Is Highly Conserved

question 45

Multiple Choice

Homeotic genes contain a homeobox sequence that is highly conserved among diverse species. The homeobox sequence encodes a protein domain that binds DNA and regulates development. Which of the following statements is correct regarding homeotic genes?

• A) Homeotic genes are selectively expressed as an organism develops.
• B) Homeoboxes cannot be expressed in invertebrate species.
• C) Homeotic genes in apes and humans are very different.
• D) Homeobox sequences have shown convergent evolution among species.

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