Transformed bacteria revealed the link between genes and DNA
F. Griffith worked with two strains of Streptococcus pneumoniae bacteria
S strain caused pneumonia when injected into mice, killing them
R strain did not cause pneumonia when injected
Transformed Bacteria Mouse injected w/bacteria Results Conclusions R strain does not cause pneumonia S strain does cause pneumonia Heat-killed S strain does not cause pneumonia Substance from heat-killed S strain can transform harmless R strain into deadly S strain
He is "inherently gloomy about the prospect of Africa". –October 2007
To him, the real cause of Africa's woes is that black people are inherently less intelligent than other races. "All our social policies are based on the fact that their intelligence is the same as ours — whereas all the testing says not really,"
He hoped that everyone was equal, he continued, but "people who have to deal with black employees find this not true".
Watson has repeatedly supported genetic screening and genetic engineering in public lectures and interviews, arguing that stupidity is a disease and the "really stupid" bottom 10% of people should be cured
He has also suggested that beauty could be genetically engineered, saying "People say it would be terrible if we made all girls pretty. I think it would be great .”
The Watson-Crick Model of DNA Structure Hydrogen bonds form between complementary bases Complementary base pairs hold the two DNA strands together DNA is a double helix of two nucleotide strands
The two resulting DNA molecules have one old parental strand and one new strand ( semiconservative replication )
The Semiconservative Replication Model One DNA double helix Duplicated Chromosome Chromosome Daughter chromosomes half old , half new Both strands of original DNA serve as templates Sister Chromatids
Replication Bubble Replication forks move in opposite directions Replication Forks Replication Bubble Parental Daughter DNA replication begins DNA replication progresses DNA replication completed