Genes, Chromosomes, and the mechanism of mendelian Inheritance Cells reproduce via a cell cycle Meiosis is the key to sexual reproduction and Mendel's rules Sex determination, sex linkage and chromosome nondisjunction supported the chromosome theory
Genes, Chromosomes, and the mechanism of Mendelian Inheritance • Cells reproduce via a cell cycle • Meiosis is the key to sexual reproduction and Mendel’s rules • Sex determination, sex linkage and chromosome nondisjunction supported the chromosome theory
Metaphase chromosomes Pair of homologous Pair of homologous metacentric chromosomes acrocentric chromosomes Centromere Centromere Sister Nonsister chromatids chromatids Nonhomologous chromosomes Homologous chromosomes Homologous chromosomes
(a)Cell cycle M The cell cycle interpet mosome /cation G1: interphase, gap before duplication B b S: DNA synthesis and chromosome duplication A 日 Go: interphase, gap B before m mitosis a B bb
Cells reproduce by a cell cycle Cells in the body reproduce by mitosis 6.⑤ Mitosis produces cells with exact G Cytokinesis First gap copies of the parental cell Telophase s chromosomes and Synthesis Mitosis genes. Interphase Second gap
Cells reproduce by a cell cycle • Cells in the body reproduce by mitosis. • Mitosis produces cells with exact copies of the parental cell chromosomes and genes. Fig. 3.1
Contractile ring Cleavage furrow Cell late