Cions. Why has so much effort been expended on studying DNA, a single
molecule? One reason is that DNA could be viewed as the key to
understanding life itself. Separate the following roles into those that
are directly attributable to DNA and those that are not.
in
rork
the
storing genetic information
regulating body temperature
cterial
nat
preventing mutations
providing the template to build proteins
bre
any
ental
allowing copies of genetic material to be made as part of cell
division

During crossing-over, a. genetic material is exchanged between nonsister chromatids, resulting in new combinations of alleles. b. nonsister chromatids from each homologous chromosome of a tetrad are exchanged, resulting in new combinations of alleles. c. one homologous chromosome of a tetrad is exchanged with another tetrad, resulting in new combinations of alleles. d. sister chromatids from each homologous chromosome of a tetrad are exchanged, resulting in new combinations of alleles. e. genetic material is exchanged between sister chromatids, resulting in new combinations of alleles.