L14 DNA errors

L14 DNA errors - Chapter 14 Lecture Guide DNA Errors and...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 14 Lecture Guide DNA Errors and Repair Mutations A heritable change in the genetic material Essential to the continuity of life Source of variation for natural selection New mutations are more likely to be harmful than beneficial DNA repair systems reverse DNA damage Cancer is a disease caused by gene mutations Mutations can be: a. Somatic or germ cell b. Spontaneous Errors in DNA replication Products of metabolic processes such as free radicals Damage to nucleotides Rates vary from species to species and from gene to gene Expected rate of background mutation approximately 1 mutation for every 1 million genes c. Induced Brought on by environmental agents Rate is higher than the spontaneous mutation rate Mutagens are chemical or physical agents Can alter DNA in various ways DNA Repair All living organisms must have the ability to repair changes that occur in DNA in order to minimize mutation Requires… DNA damage be detected
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 4

L14 DNA errors - Chapter 14 Lecture Guide DNA Errors and...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online