Red blood cells are the most common type of blood cell. they are responsible for carrying oxygen from the lungs to all the various body tissues. these cells are shaped like concave discs, and they do not have mitochondria or nuclei. how does this structure the cell carry out its function?

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.