Some Members of the Species D

question 26

Multiple Choice

Some members of the species D. bifasciata produce mostly female offspring if reared at or below 21°C. The causative agent of this condition (called sex ratio) is a protozoan infection that is lethal to most male larvae. How can you demonstrate that it is both inherited and extrachromosomal?

• A)Inject ooplasm of affected females into normal females and then mate these with normal males.
• B)Inject cytoplasm from somatic cells of an affected female into normal females and then mate them with normal males.
• C)Mate affected females with normal males and assess daughter somatic cells for presence of the protozoan.
• D)Perform reciprocal crosses of affected and normal individuals and examine the offspring for infection.
• E)Perform reciprocal crosses of affected and normal individuals and look for affected male offspring.

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