A60-year-old woman is experiencing vertigo. she ignores the symptoms initially, but now her attacks are accompanied by severe nausea and vomiting. following an attack, she hears a roaring in her ears that causes temporary deafness for some time after. what do you think her problem is, and what is its suspected cause?

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.