Measures of Dispersion and Variability: Range, QD, AD and SD
Darwin's voyage final
1. The Voyage of the Beagle
(1831 - 1836)
Dr. Karobi Moitra
2. Who was Charles Darwin?
A famous naturalist
Traveled around the world in
the HMS Beagle
Came up with the idea of
“Origin of species by
means of natural selection”
Organisms selected by how
(1809 - 1882) fit they were to survive -
“Survival of the fittest”
4. How did Darwin get interested in Science &Nature?
As a child his favorite pass times were climbing trees,
catching rats, playing with dogs and taking long walks
in the country to collect whatever he could find
Charles did not do well at school
At age 13 he and his brother set up a chemistry lab in the
tool shed of their garden where he learnt the basics of
scientific experimentation
As he grew older he became interested in bird watching,
collecting minerals, beetles and taxidermy (collecting and
stuffing specimens)
5. Darwin’s education
1826 his father sent him off to Edinburgh Medical School
He spent his time bird watching, collecting specimens
hiking and reading books about nature.
He quit medical school 1 1/2 years later.
Darwin decided he wanted to be a clergyman/naturalist
He passed the final exam with flying colors with the help of
Revd. Henslow and dreamed of exploring the tropics.
6. Darwin the explorer
In 1831 Darwin was offered the position of a naturalist
On the HMS Beagle by Captain Fitzroy
Darwin’s father did not want him to go because he thought
it would be a “complete waste of time”
Darwin set sail on the HMS Beagle on the 27th of Dec
1831
He became seasick immediately and started having
second thoughts about the voyage.
16. Adaptive radiation in Darwin’s finches
One ancestral species (ground dwelling seed eating)
Different species evolved in different niches
Origin of species by means of natural selection
Niches exert the selection pressure
17. Darwin’s Theory
The origin of species by means of natural selection
Large populations Struggle for existence
Struggle for existence Survival of the fittest
Survival of the fittest Natural selection
Natural selection Speciation
18. Darwin’s book
Published in 1859
Based on principles
outlined by Wallace
and Darwin in 1858
at a presentation on
July 1st at the
Linnean Society
