This preview shows pages 1–2. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
Unformatted text preview: Chapter 9- The Reproduction Of Cells I. Genome Of Eukaryotic Cells • There are 46 chromosomes in a human somatic cell. Reproductive cells, or gametes, have half as many chromosomes. • Chromatin is organized into a long thin fiber that is compactly folded and coiled to form the chromosomes. The cell copies its entire genome by duplicating each chromosome. Each chromosome consists of two sister chromatids after replication. The centromere holds the chromatids together. • In mitosis, the sister chromatids are pulled apart and repackaged as complete chromosome sets in two nuclei, one at each end of the cell. The cell then splits by cytokinesis. II. Cell Cycle & Mitosis • Interphase is composed o the G1, S and G2 phases. During all three phases the cell grows by synthesizing proteins and manufacturing organelles. However the chromosomes are replicated specifically in the S phase. • Microtubules extend from the centrosomes in radial arrays called asters. Centrioles are present outside of the nucleus during Interphase and the mitotic spindle develops from it. of the nucleus during Interphase and the mitotic spindle develops from it....
View Full Document