Biology 1001A Lecture 11: Lecture 11.docx

26 views1 pages

Document Summary

Relative sizes of typical mitochondrial, chloroplast and nuclear genomes - Nuclear genome is 120 000 kb compared to 16 kb of mitochondria and 200 kb of chloroplast. Rubisco structure and assembly from components coded by different genomes - Possible reasons why modern organelle genomes have become dramatically smaller over evolutionary time - Genes have been deleted as there is no need for redundancy with nuclear genes eg. gene for hexokinase allowing glycolysis. Selection favours organelles getting rid of as much genes as possible so long as they"re redundant; they are deleted by deletion or mutation. Possible reasons why genes have moved to the nucleus from organelles over evolutionary time - Coordinated control / greater control in nucleus. Mitochondria and chloroplasts are sites of reactive oxygen species production, which can be mutagenic and damaging; thus makes sense to get genes away from there so that they are safer in nucleus.

Get access

Grade+20% off
$8 USD/m$10 USD/m
Billed $96 USD annually
Grade+
Homework Help
Study Guides
Textbook Solutions
Class Notes
Textbook Notes
Booster Class
40 Verified Answers
Class+
$8 USD/m
Billed $96 USD annually
Class+
Homework Help
Study Guides
Textbook Solutions
Class Notes
Textbook Notes
Booster Class
30 Verified Answers

Related Documents