Covering both the internal and external incubation of offspring, this book supplies a biology-rich study of the nature, ecology, genetics, and advancement of pregnancy-like phenomena. From mammals and other live-bearing organisms to viviparous reptiles, male-pregnant fishes, larval-brooding worms, crabs, sea cucumbers, and corals, the world’s different species display pregnancy and other kinds of parental dedication in remarkably multifaceted ways. An adult female (or male) can incubate its offspring in a womb, stomach, mouth, singing sac, gill chamber, epithelial pouch, knapsack, leg pocket, nest, or an enclosing of embryos, and by studying these varied examples from a comparative viewpoint, the eco-friendly and evolutionary-genetic outcomes of different reproductive models end up being fascinatingly clear. John C. Avise discusses each mode of pregnancy and the decipherable genetic signatures it has left on the reproductive structures, physiologies, and natural sexual habits of extant types. By considering the numerous biological elements of gestation from various evolutionary angles, Avise offers captivating brand-new insights into the significance of “heavy” adult investment in kids.
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