BISC 1111 Lecture Notes - Lecture 6: Cytokinesis, Zygote, Synapsis
Document Summary
Rosalind franklin: x ray diffraction and found dna helix. Replication proceeds in both directions from each origin, until entire molecule is copied. Lagging strand: 3" to 5": starts with rna primer, okazaki fragments, dna pol i replaces rna with dna, dna ligase from bond between dna fragments. Mismatch repair of dna: repair enzymes correct errors. Postpone erosion of genes near the ends of dna. Cell division (reproduction of cells: chromatin condenses, dna replicated, each chromosome is duplicated to 2 sister chromatids. Transmit genes from one generation to the next. Somatic cells: all cells of the body except gametes and precursors. Locus: gene"s specific location along length of chromosome. Asexual reproduction: single individual is sole parent and passes copies of all genes. All genes to offspring without fusion of gametes. Sexual reproduction: 2 parents give rise to offspring with unique combination of genes. Homologous duplicated chromosomes: 2 chromosomes of a pair have same length, centromere position and starting patttern.