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Unformatted text preview: 17 1.5 Genes, the environment, and the organism genomes. There is no environment in which a lion will give birth to a lamb. An acorn develops into an oak, whereas the spore of a moss develops into a moss, even if both are growing side by side in the same forest. The two plants that result from these developmental processes resemble their parents and differ from each other, even though they have access to the same narrow range of materials from the environment. Even within species, some variation is entirely a con- sequence of genetic differences that cannot be modified by any change in what we normally think of as environ- ment. The children of African slaves brought to North America had dark skins, unchanged by the relocation of their parents from tropical Africa to temperate Mary- land. The possibility of much of experimental genetics depends on the fact that many of the phenotypic differ- ences between mutant and wild-type individuals result- ing from allelic differences are insensitive to environ-...
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This note was uploaded on 01/10/2011 for the course BIOL BIOL taught by Professor Johnson during the Spring '08 term at Aberystwyth University.
- Spring '08