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 them
C) their expression along the dorsal-ventral axis
D) the mutations to which they give rise
E) their bilateral symmetry
Correct Answer:
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