What is the difference between mark rowland and Douglas Ellen beetle systems des

Question

What is the difference between mark rowland and Douglas Ellen beetle systems described in " two thresholds, three forms result in facultative male trimorphism in beetles" and other examples of male trimorphism cited by the authors ( in ISOpods , lizards , and birds) for those who have read this short article . What is the difference between mark rowland and Douglas Ellen beetle systems described in " two thresholds, three forms result in facultative male trimorphism in beetles" and other examples of male trimorphism cited by the authors ( in ISOpods , lizards , and birds) for those who have read this short article .

Explanation / Answer

The difference is that :In beetles, the male trimorphism is not inherited by particular genes and their alleles but they are facultative in nature which means that the forms are expressed in response to specific environmental conditions that the male beetles encounter whereas in isopods,lizards and birds, the male trimorphosm is the result of inheritance of different alleles and is therefore not facultative in nature.

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