Conservation Biology

Monday, July 24, 2006


Journey of Man is a National Geographic documentary about the Y chromosomal lineage of human kind. The documentary presents a hypothesis, based on an analysis of the Y chromosome found in men, which trace man’s journey out of Africa.

The sex chromosomes do not get chopped up and reshuffled as the other chromosomes do during sexual reproduction. That means that a father will pass on an exact replica of his Y chromosome to his son. Sometimes a mutation occurs during replication and this mutation is then passed on to all male descendants. These tell-tale mutations are used as markers by geneticists to trace back specific lineages. Documenting specific markers allowed them to reconstruct the most likely routes taken by our ancestors to populate the globe. Dr. Spencer Wells is a geneticist, who was part of a team of scientists that analyzed the Y-chromosome, of isolated populations. In this documentary Spencer Wells takes the viewer on a scientific tour of the routes and extraordinary detours he believes humankind took during this epic journey.

According to Wells, it all started some 50 000 – 60 000 years ago in Africa. The most ancient Y chromosome marker was found in the San people of Botswana. Thus, it is here where his journey begins. The next stop in this incredible journey is Australia, as a marker found in the south of India links the Australian Aborigines to Africa. The journey continues to south-east and then to central Asia. It is here that a marker was found that links almost all Europeans, Asians and Native Americans, hence Spencer Wells refers to central Asia as the “nursery of humankind”. In Siberia he meets up with nomadic reindeer herders; around 13 000 years ago a group of their forefathers crossed into the Americas, populating the New World.

The journey portrayed by Spencer Wells seems incredible; at times almost impossible, taking the harsh conditions and stumbling blocks into account. The story is well narrated with a good mix of scenery, interesting history, real people and hard science. The hypothesis is collaborated by experts from different fields, offering explanations of why certain routes were taken and of specific physical adaptations that occurred under certain conditions. The viewer also gets a glimpse of some of the descendants along the routes followed by mankind. There is currently little archaeological evidence to support this hypothesis, but changes in global climatic conditions do fit with the explanations provided.

I did find Spencer Wells’s approach at times somewhat insensitive, offering his scientific theory to people who had not asked for it. Sensing the animosity from an Australian Aborigine and later also from Navaho Indians, he explained that this is a European way of looking at the world by stating: “my bias as a scientist is I want to see evidence”. But does this make it ethical to offer information that may be disturbing to people with their own rich cultures and beliefs if they had not asked for it?

Overall, I found the documentary fascinating, but it would have been even better without the focus on a “scientist hero trying to enlighten the world” theme to it. I also do not agree with the way everything was portrayed as the absolute truth, while ultimately it remains only a hypothesis. The two things that struck me most was; 1) the statement that modern man’s curiosity and his ability to imagine something beyond what he can see, along with incredible adaptability and endurance, took humankind to all corners of the world, and 2) the fact that the available scientific evidence illustrates how closely we are all linked together, which should ultimately serve to unite us.

Karen Marais
BCB Hons NISL student
University of the Western Cape
Private Bag X17




  • i honestly didnt get the movie at all! i am spose to write a five page essay for global studies, but how am i spose to do that if i have no idea what the movie is talking about?!

    By Anonymous Anonymous, at September 20, 2010 12:33 AM  

  • I also have a five paragraph essay due fisrt period tomorrow morning. I'm haveing trouble figuring out what the teacher really wants us to write about this movie. It says to "pretend your a film critic" but its also all about history so I have No Idea what to do!!!

    By Blogger snow pea, at September 20, 2010 7:18 AM  

  • Are you serious? That is NOTHING. Pfft I can just make as I go. You don't have to deal with high advance ones like calculus and physics and really deeply understand it.

    Your stuff is easy to bs. just read the blog and make the essay around it. So simple. Use your brain for once.

    By Anonymous Anonymous, at April 11, 2011 5:38 PM  

  • This is very helpful saves a lot of time for those needing to write summaries!


    By Anonymous Anonymous, at May 02, 2011 8:05 AM  

  • Honestly Wells was quite possibly the worst choice for this film.

    By Anonymous Anonymous, at November 10, 2011 3:20 AM  

Post a Comment

Links to this post:

Create a Link

<< Home