In recent years, cytogenetic studies show that sister chromatid exchanges (SCE) during mitosis in higher organisms are the exchanges between DNA double-strands, and the frequencies of exchanges may be enhanced when ce...In recent years, cytogenetic studies show that sister chromatid exchanges (SCE) during mitosis in higher organisms are the exchanges between DNA double-strands, and the frequencies of exchanges may be enhanced when cells are treated with various exogenous agents. Furthemore, the formation of SCE is closely related to the展开更多
In human and other mammalian populations there are many inheritable traits that do not appear to have gross phenotypic effects. These normal variations occur more frequently than that as expected from recurrent mutati...In human and other mammalian populations there are many inheritable traits that do not appear to have gross phenotypic effects. These normal variations occur more frequently than that as expected from recurrent mutation rates alone. With the展开更多
文摘In recent years, cytogenetic studies show that sister chromatid exchanges (SCE) during mitosis in higher organisms are the exchanges between DNA double-strands, and the frequencies of exchanges may be enhanced when cells are treated with various exogenous agents. Furthemore, the formation of SCE is closely related to the
文摘In human and other mammalian populations there are many inheritable traits that do not appear to have gross phenotypic effects. These normal variations occur more frequently than that as expected from recurrent mutation rates alone. With the
