Genetics I 2010

Genetics I 2010 - Genetics for Human Evolution Where do we come from Have life forms changed Creationism the world and everything in it was created

Info iconThis preview shows pages 1–9. Sign up to view the full content.

View Full Document Right Arrow Icon
Genetics for Human Evolution Where do we come from? Have life forms changed? Creationism: the world and everything in it was created divinely all at once, and life forms are immutable (don’t change). By end of 1700s accepted that life forms had changed – but by what mechanism?
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Inheritance of acquired characteristics: During lifetime of an individual, changes occur that are passed on to an offspring. X Discounted X http://shirts.meetees.com/CHARLES.html Picture added by Erica Shofner
Background image of page 2
Natural selection: Organisms are adapted to their environment; Variation already exists among a population; Population undergoes adaptive change when the environment changes; Those members of the population best adapted will survive. Those who survive pass on their variation to the next generation. There is no direction to evolution . Organisms change as a result of natural selection through survival of the fittest.
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Environment of today Distribution of variation in population Environment changes Now only the humans with these variations can survive These humans die before reproducing In the next generation the distribution of variation in the population changes
Background image of page 4
Theory of Natural Selection formulated by Charles Darwin and Alfred Russell Wallace Wallace published first, but Darwin had thought of natural selection 20 years before but was afraid to publish. Charles Darwin, 1859 On the Origin of Species by Means of Natural Selection The entire first edition of 1,250 copies was sold out the first day it appeared. www.smh.com.au
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Darwin was naturalist on voyages of HMS Beagle 1831-1836 Convinced him of natural selection rather than divine creation. In his Autobiography, he says he finally wrote an abstract of this theory in 1842, and he enlarged it in 1844. In 1844 he wrote to J. D. Hooker (a famous botanist): At last the gleams of light have come, and I am almost convinced (quite contrary to the opinion I started with) that species are not (it is like confessing a murder) immutable .”
Background image of page 6
Darwin and Wallace didn’t know the mechanisms by which variation was present in populations – our understanding of genetics is based on work by Gregor Mendel in 1866 but not rediscovered until 1900
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Darwin vs. Lamark Key difference in the two theories Inheritance of acquired traits (Lamark)- variation arises when needed Natural selection (Darwin) – variation already exists and nature selects those variations that are best suited to the current environment
Background image of page 8
Image of page 9
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 10/04/2011 for the course ANTH 101 taught by Professor Simmons during the Spring '06 term at South Carolina.

Page1 / 37

Genetics I 2010 - Genetics for Human Evolution Where do we come from Have life forms changed Creationism the world and everything in it was created

This preview shows document pages 1 - 9. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online