Platyfish with Spots Have an X-Linked Gene That Produces the Spots.All

question 241

Multiple Choice

Platyfish with spots have an X-linked gene that produces the spots.All platyfish have an autosomal repressor that inhibits the expression of the spot-producing gene.The closely related swordtail lacks both the spot-producing gene and the repressor.In backcrosses between these two species, some hybrids receive the spot-producing gene, but not the repressor.These hybrid individuals should have reduced viability because they often develop malignant tumors due to improper regulation of the expression of the spot-producing gene.What can we conclude?

• A) The ancestor of these fish likely had the spot-producing gene without the repressor.
• B) This scenario is inconsistent with the Dobzhansky-Muller model.
• C) Hybrids with the repressor, but not the spot-producing gene, should have high viability.
• D) Reinforcement is likely to occur.
• E) An adaptive radiation will likely occur.

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