Question

Give an example of where sex determination is reflected by environmental factor

Answer 1

In some organisms, the environment determines the sexual phenotype of the individuals. Thus, some environmental factors, size of parent body or of egg, age of parent and temperature are found to determine the sex in following cases:

(a) The sex of some reptiles may depend upon the temperature at which the individual develops. For example, in most turtles, only females are produced at high temperature (30-35°C) and only males are produced at low temperature (23-28°C). The reverse is true in crocodiles, alligators and some lizards, where males are produced at high temperature and females are produced at low temperature.

(b) The marine annelid Ophryotrocha differentiates into a sperm producing male as a young animal and then changes into an egg-laying female when it gets older. If parts of an older female is amputated, the annelid reverts to the male form, indicating that size rather than age is the important factor controlling the sex of the individual.

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