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What is Reproduction and Life Cycle about?

In Chapter 1 we defined the life cycle of an organism as the sequence of developmental transformations and reproductive phases that lead from a given stage of development of a given organizational form of that organism, to the same stage of development of the same organizational form in a following generation. Thus modes and times of reproduction contribute in a fundamental way to the characterization of a life cycle. Accordingly, this chapter is not an examination of how reproduction occurs in otherwise defined life cycles, but rather it aims to show how diversity of reproductive processes contributes to diversity of life cycles.As we will see, life-cycle features vary greatly among living things, sometimes exhibiting a high degree of complexity. Although it may be difficult to produce a rigorous definition of life-cycle complexity, intuitively we might suggest that this is related to the number and scope of the changes the organism undergoes during its cycle. These may be changes in the organism's form, such as between the pluteus larva and the adult sea urchin, or changes in the environment, such as between the pelagic larva and the benthic adult of many aquatic molluscs, or cha

Published

2019

Language

EN