PNB 2XC3 Chapter Notes - Chapter 2: Maternal Sensitivity, Internal Fertilization, Frog
23 Oct 2017
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Document Summary
Arti cial selection: the process of humans deliberately choosing certain varieties of an organism over others through breeding programs: the evolutionary process leading to variation is natural selection; traits with the highest success to their bearers increase over time. Arti cial selection: experiment in russia selecting the tamest foxes and breeding them; creates very docile foxes. Phylogeny and the study of animal behaviour: darwin said evolution has 2 main laws, 1. conditions of existence (biotic and abiotic environment that sets the stage for natural selection, 2. common ancestry. Maternal care evolved after species moved from external to internal fertilization: 2. In external fert. paternal care was found alongside intense male coloration and nest construction: 3. Male coloration was associated with systems in which females fertilized eggs internally: did not nd evidence for stepping-stone; evidence instead for multiple origins of all parental care systems.
