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3. The engrailed gene of Drosophila plays an important role in determining the polarity of segments...

3. The engrailed gene of Drosophila plays an important role in determining the polarity of segments in the embryo. The gene also plays an important role in the growth of axons of neurons in the brain. From this information, it can be said that that the engrailed gene is

A. completely penetrant.

B. polygenic

C. pleiotropic

D. A and C

E. B and C

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Answer #1

Option D. Completely penetrant and pleiotropic

It is evident from the example that

  1. The engrailed gene is expressed in all the population who have the genes.Therefore we can consider them as fully penetrant and
  2. The engrailed gene have pleiotropic ie it control more than one trait (here determining the polarity of segments in the embryo and growth of axons of neurons in the brain)

Therefore option D is the correct answer

Polygenic trait is a trait/phenotype which is determined by many genes. Therefore option C and E are wrong

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