THE TREE OF LIFE:
CLASSIFICATION AND PHYLOGENY
We have grouped organisms for easier study by comparing similarities and differences.
CLASSIFICATION OR TAXONOMY is the ordering of organisms into groups. It includes the
principles procedures used in classif
Zebrash is becoming increasingly important in organogenesis research
The main approach to research with the zebrash has been through mutagenesis, and this
means that mutations are available in many of the important genes.
Phylogeny: The history of descent of a group of taxa such as species from their common ancestors,
including the order of branching and sometimes the absolute times of divergence; also applied to
the genealogy of genes derived from a common ancestral gene
Why Xenopus is used for studying?
-Egg contains a high content of yolk.
-Used as fluorescents for cell lineage labeling.
Control of mRNA
-The use of
A process of genetic change in a population whereby, as a result of natural selection, the
average state of a character becomes improved with reference to a specific function, or
whereby a population is thought to have become better suited to s
What is phylogenetics?
relationships between species.
What is a phylogeny?
The evolutionary history of a group; also used
synonymously as a evolutionary tree.
What is speciation?
The formation of a new and distinct spe
All organisms are composed of cells. Knowledge of their structure and
function underpins much of biology. The fundamental differences between
eukaryotic and prokaryotic cells are explored and provide useful biological
background for the sec