Meiosis, which occurs during sexual reproduction, allows for a great variety of possible gene combinations. which of the following can increase genetic variation during meiosis? a. the deletion of a gene caused by an error in chromosomal crossover b. the transposition of a gene from one place in an organism's genome to another c. the exchange of genes during chromosomal crossover d. the duplication of a gene caused by an error in chromosomal crossover

Match the following terms describing electrical events with the correct phases of the cardiac cycle. the ventricular muscle cells depolarize at the start of this phase. during this phase, na+ entry through the funny channels causes the pacemaker potential of sa nodal cells to gradually become less negative until it reaches threshold. the ventricular muscle cells repolarize right before this phase. the cytosolic concentration of calcium in the contractile cells of the ventricle is highest during this phase. a. isovolumetric relaxation b. ventricular ejection c. isovolumetric contraction d. ventricular filling

What happens during interphase? (1)the nucleus grows to its full size. (2)the cell grows to its full size. (3)the nucleus divides into two nuclei. (4)the cell divides into two cells.

The normal shape of an enzyme is as shown in structure a. if the enzyme’s shape changes to that shown in structure b, what are two consequences of this change?