PSYC 301 Lecture Notes - Lecture 5: Congenital Heart Defect, Monosomy, Edwards Syndrome
Document Summary
The two divisions of meiosis- figure 13. 7: meiosis 1, reduction division: chromosome number reduced in half (2n to n) What is sexual reproduction: two parents- five rise to offspring, each parent passes half of genes to offspring, offspring have unique combination of genes from inherited both parents, results in greater genetic variation. If parent has mutation: not all have it. What is spermatocyte: occurs in sex cells. Meiosis 1: meiosis ii typically produces four haploid cells, each is diploid. Mitosis: one division, two daughter cells per cycle-genetically identical, chromosome number of daughter cells= same as parent cell (2n, occurs in somatic cells, occurs throughout life cycle, used for growth, wound repair, asexual reproduction. Meiosis: two divisions, 4 daughter cells per cycle, daughter cells-genetically different, chromosome number of daughter cells half that of parent cell (1n, occurs in germline cells, used for sexual reproduction/genetic variation. Sources of genetic variation: crossing over, homologous chromosomes (m/f) exchange genetic information prophase i.
