update

[chloroplast13.git] / intro.tex

diff --git a/intro.tex b/intro.tex
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--- a/intro.tex
+++ b/intro.tex
@@ -17,10 +17,10 @@ in the atmosphere (allowing extant life) and are the main source of mid-
 to long term carbon stockage (using atmospheric CO2, important in the 
 context of climate change). Chloroplast found in Eucaryots have an endosymbiotic origin, meaning 
 that they are a fusion of a photosynthetic bacteria (Cyanobacteria) and 
 to long term carbon stockage (using atmospheric CO2, important in the 
 context of climate change). Chloroplast found in Eucaryots have an endosymbiotic origin, meaning 
 that they are a fusion of a photosynthetic bacteria (Cyanobacteria) and 

-a eucaryotic cell (enable to produce organic matter = heterotrophic). 
-This fusion or First Endiosymbiosis ended in a Great diversification of 
-a lineage comprising Red Algae, Green Algae and Land Plants (terrestrial).
-Several Second Enbiosymbioses occurred then: two involving a Red 
-Algae and other heterotrophic eucaryotes and giving birth to both Brown 
-Algae and Dinoflagellates lineages; another involving a Green Algae and 
-a heterotrophic eucaryot and giving birth to Euglens.
\ No newline at end of file
+a eucaryotic cell (enable to produce organic matter from solar energy = heterotrophic). \\
+
+By  the  principle  of
+classification, a  small number of genes lost  among species indicates
+that these species are close to  each other and belong to same family,
+while a  large lost  means that we  have an  evolutionary relationship
+between species  from different families.