The Figure Shows the K_a /K_s Values for Two Regulatory

question 46

Multiple Choice

The figure shows the K_a /K_s values for two regulatory genes in pairs of species in (A) North American tarweeds and (B) Hawaiian silverswords. The dashed lines are the mean K_a/K_s values. What do these data indicate about how these genes are evolving differently in these two groups of taxa? A


B

• A) They are evolving neutrally in the tarweeds and under purifying selection in the silverswords.
• B) There have been more mutations in this gene in the silverswords than the tarweeds.
• C) They have experienced purifying selection in the tarweeds and positive selection in the silverswords.
• D) They have undergone gene conversion in the tarweeds but not in the silverswords.

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