BI226 Chapter Notes - Chapter 2: Spermatogenesis, Basal Body, Gametophyte
Document Summary
Cytologists and geneticists in early 20th century determined that genes were carried on chromosomes. Plant cells have an outer covering called cell wall made of a polysaccharide called cellulose (over the plasma membrane) In order to understand heredity, we need to understand the behavior of chromosomes during the cell cycle, mitosis and meiosis. Animal cells have glycocalyx, consists of glycoproteins & polysaccharides covering over the plasma membrane too. Genetic material of eukaryotes is often distributed among multiple linear chromosomes. Chromosome in eukaryotic cells, a linear structure composed of a single dna molecule complex with protein. Each species has a certain # of chromosomes in the nucleus of its cells. In nucleolus, ribosomal rna (rrna) is made. Areas of dna that encode rrna are call nucleolus organizer region (nor) Cytoplasm consists of mostly tubulin derived microtubules & actin-derived microfilaments. Endosymbiotic hypothesis mitochondria & chloroplast were once free living organisms that formed a symbiotic relationship with a primitive eukaryotic cell.