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Do all species of plants and animals have the same amount of DNA?

Yeast, the organisms put in bread to make it rise, have about 6,000 genes. Humans have about 30,000.
 

No, there are very, very different amounts of DNA in things. But just because you have more DNA doesn't mean you're better, or you're more advanced. Certain species of amoebas, for instance, have much, much more DNA per cell than humans do. In essence, it's how genes are used that determines how complex living things are.

Now, if you want to talk about numbers of genes, it becomes a little bit more important. For example, yeast, the organisms that you put in bread to make it rise, have about 6,000 genes. Drosophila, the fruit flies you might see flying around fruit, have about 13-14,000 genes. Humans have about 30,000.

Interestingly, we don't have that many more genes than flies or even yeast. So it's really how an organism uses those genes that determines how complex an organism is.