The marine echiurid worm BoneIlia viridis is an extreme example of environmental influence on sex determination. Undifferentiated larvae either remain free-swimming and differentiate into females, or they settle on the proboscis of an adult female and become males. If larvae that have been on a female proboscis for a short period are removed and placed in seawater, they develop as intersexes. If larvae are forced to develop in an aquarium where pieces of proboscises have been placed, they develop into males. Contrast this mode of sexual differentiation with that of mammals. Suggest further experimentation to elucidate the mechanism of sex determination in B. viridis.
HINT: This problem asks you to analyze experimental findings related to sex determination. The key to its solution is to devise further testing with the goal of isolating the unknown factor affecting sex determination and testing it experimentally.
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