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Genetics is a hot learning in the current biology fields. Mendel discovered the law of heredity in 1866. Full study of genetics began after 1990. And many things such as the body of the gene and the phenotypic expression have been known. Nevertheless, still now genetics has many unknown parts. So genetics can be said one of the most interesting learning field.
The fact that the body of a gene is DeoxyriboNucleic Acid(DNA) was proved by following
two experiments. [The experiment by Avery]
Pneumococcus has two types. One is the S-type that has pathogenicity and the other is
R-type that does not have pathogenicity. A mouse injected heated S-type does not become
pneumonia. But if heated S-type and the R-type are mixed and injected into a mouse, the
mouse becomes pneumonia. The fact this mouse has the S-type shows that something of the
heated S-type changes the R-type into the S-type. And then, if the DNA of S-type and the
R-type are put in the culture medium together, a part of the R-type changes into the
S-type. This proved that the body of a gene is DNA.
[The multipulication of a phage]
Viruses which go into bacteriums and multiply in them are called
"bacteriopahage." These phages consist of protein and DNA. In these phages, a T2 phage adheres to the colon bacterium and let only the
DNA part go into the colon bacteium, then a lot of children of the T2 phage are generated.
This fact also shows that the body of a gene is DNA.
the 3-D figure with the name: $HOME/hubed/t2.tar
(c) 1994-95 Chiyokura Laboratory, Keio University Shonan
Fujisawa Campus
and the Information-technology Promotion Agency,
Japan(IPA).
Modificado em: 18-01-1999
