How are the cells of animals, plants, fungi, protists and bacteria similar?
A. They all contain genetic material enclosed within a nucleus.
B. They all have ways of obtaining and using energy.
C. They all have ways of converting sunlight into food.
D.
They all contain cell walls for protection.

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.