Some male tree lizards (Urosaurus ornatus) are aggressive while others are nonaggressive. They are one phenotype or the other and remain so for life. These alternative phenotypes are said to be
A) developmentally fixed.
B) developmentally plastic.
C) dichotomously flexible.
D) dichotomously segregated.

Question

Quizplus · Accepted Answer

The term "developmentally fixed" means that once an organism develops a particular trait or phenotype, it remains fixed for life. Since the male tree lizards remain either aggressive or nonaggressive throughout their lives, their phenotypes are considered developmentally fixed.

Some Male Tree Lizards (Urosaurus Ornatus) Are Aggressive While Others