Homeotic Genes Contain a Homeobox Sequence That Is Highly Conserved

question 26

Multiple Choice

Homeotic genes contain a homeobox sequence that is highly conserved among very diverse species. The homeobox is the code for the domain of a protein that binds to DNA in a regulatory developmental process. Which of the following statements is therefore correct regarding homeotic genes?

• A) Homeotic genes are selectively expressed as an organism develops.
• B) Homeoboxes cannot be expressed in nonhomeotic genes.
• C) Homeotic genes in apes and humans are very different.
• D) All organisms must have homeotic genes.

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A quantity or factor in an experiment or equation that can change or be changed.

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