Human Hox Genes Are in Four Clusters: HOXA, HOXB, HOXC

question 30

Multiple Choice

Human Hox genes are in four clusters: HOXA, HOXB, HOXC, and HOXD, for a total of 39 genes. Besides conserving the clustering of genes, evolution has also conserved________ .

• A) their chromosomal locations
• B) the order of the genes within the clusters
• C) their bilateral symmetry
• D) their expression along the dorsal- ventral axis
• E) the number of HOX genes

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