Sunday, January 31, 2010

A GENETISIST'S ANSWERS

Did you know that goldfish have 94 chromosomes when we, human beings, only have 46? All organisms have a different number of chromosomes. Why? Well according to Flo Pauli of Stanford University, what makes two organisms different is the genome that doesn't code for genes which directs the activity of the genes in the genome. The genes give instructions for making proteins but only 3% in genome codes for protein. This means that 97% of the genome could be controlling the time, amount, and place of protein being made. For example humans and chimps are very alike. The proteins are very similar but the difference is the amount of protein being made in the brain. I found this answer very interesting. This made me want to explore more facts about genomes.
Have you ever wondered why the human genome is split into separate chromosomes rather than being one long strand? Our DNA is a mixture of our parents DNA. According to Dr.Bronwyn MacInnis, some of the simplest forms of life, like bacteria, keep all of their DNA in a single chromosome. However, more complex creatures, like us, split their DNA into many different chromosomes. Why exactly 46 in humans?Dr. Bronwyn doesn't have a straight forward answer. That is a mystery.

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