According to the medical model, select one: a. abnormal behavior can be thought of as a disease. b. all mental illnesses can be treated using drugs. c. all physical illnesses have a psychological component. d. all mental illnesses are caused by biological factors.

Genetic disorders can result when sister chromatids fail to seperate properly. during what phase is this problem most likely to occur?

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.

Fill in the blank with the correct sphere label. a: ⇒ geosphere b: ⇒ biosphere c: ⇒ hydrosphere