Not all genes are "on" at once; cells regulate expression based on environmental signals and developmental stages. 5. Modern Extensions
Cytogenetics identifies abnormalities that lead to genetic disorders: Principles of Genetics and Cytogenetics
Chemical modifications to DNA or histones that affect gene activity without changing the actual DNA sequence. Not all genes are "on" at once; cells
Results in two genetically identical daughter cells (somatic growth). Principles of Genetics and Cytogenetics