In Marine Sticklebacks, the Pitx1 Gene Is ____, but in Freshwater

question 100

Multiple Choice

In marine sticklebacks, the Pitx1 gene is ____, but in freshwater sticklebacks, the Pitx1 gene is ____. ​

• A)not expressed and spines are present; expressed and spines are absent
• B)not expressed and spines are absent; expressed and spines are present
• C)expressed and spines are present; not expressed and spines are absent
• D)expressed and spines are absent; not expressed and spines are present
• E)present so spines develop; absent so spines do not develop

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