1 Chromosomes and Mitosis Chapter 1 Thompson and Thompson
1 Chromosomal Basis of Heredity A gene is a unit of heredity Genes are carried on DNA DNA is contained within chromosomes as chromatin
Chromosomes replicate during cell division
The chromosome complement
Chromosome analysis Cri Du Chat results from loss of a small piece of chromosome 5
Gene Map
Chromosome pairs
Non-identical genes
Sex chromosomes These determine the sex of an individual –Two X chromosomes make a female –One X and one Y a male
Two types of Cell Division Cells divide for two reasons –To create genetically identical copies of themselves This is mitosis – To create gametes that contain half of the chromosomes of the original cell This is meiosis
The Cell Cycle
S phase Replication Condensation Schematic
DNA replication Duplex DNA begins Replicating Replication bubbles merge creating two duplexes
Mitosis
The stages of Mitosis
Prophase Detail
Prometaphase
Metaphase
Anaphase
Telophase
The sum total of the process
Karyotypes
Chromosome Length
Chromosome appearance