Question 2 2 pts A mutation in the control region of a Hox gene that is normally expressed in the thorax causes the Hox gene to be expressed in the abdomen. What is a possible consequence of this mutation? Legs growing on the abdomen Eyes growing on the thorax Eyes growing on the abdomen Legs growing on the head
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Why might a gene regulatory mutation be "safer" than a gene sequence mutation that changes the core function of a homeotic (Hox) gene? A change in the gene sequence and function of a Hox gene would potentially affect the expression of many genes during development. A regulatory mutation in the binding site of a gene that is regulated by a Hox gene is likely to have a smaller effect during development. Regulatory mutations are "safer" because natural selection cannot act upon them. Animals only have a single conserved Hox gene, so changes in its gene sequence are likely to have severe ("unsafe") effects on development.
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Researchers suggest that an increase in the number of Hox genes a. leads to reproductive isolation in all cases. b. could explain the evolution of color vision. c. allows for the evolution of more complex body patterns in animals. d. results in the decrease in the number of body segments in insects. e. does all of the above.
The homeotic mutation Antennapedia causes mutant Drosophila to have legs in place of antennae and is a dominant gain-of-function mutation. What are the properties of such mutations? How does the Antennapedia gene change antennae into legs?
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