NURSING 57:705:212 - Maternity Exam 2 Study Guide.

NURSING 57:705:212 - Maternity Exam 2 Study Guide/NURSING 57:705:212 - Maternity Exam 2 Study Guide. Process of Gamete Formation 1. Development of ova in the woman and sperm in the man 2. Somatic Cells reproduce by a process called mitosis a. 1 somatic cell has i. 46 paired chromosomes ii. 22 pairs of autosomes iii. 1 pair of sex chromosomes (x or y) 3. During mitosis the cell divides into 2 new cells, each having 46 chromosomes like the parent cell 4. Gametogenesis requires a special reduction division called meiosis a. Meiosis divides the diploid cells(46chromosomes) in half which becomes haploid (23 chromosomes) 5. Mitosis: retains the 46 chromosomes in the new cells 6. Meiosis: divides the 46 chromosomes in half becoming 23 (22 autosomes and 1 sex chromosome) 7. Oogenesis a. Formation of female gametes b. Begins during prenatal life c. When the oocyte matures, two meiotic divisions reduce the chromosome number from 46 paired to 23 unpaired chromosomes