Posts tagged diversity
After asking students during a lesson on mutations if it is possible that a mutation in DNA could be good, most students will nod yes without much understanding. Recently, I finally had one student raise his hand immediately and answer the question (with extreme surprise that no other students were blurting out the answer)…”evolution!” He was able to make the connection between changes in DNA that are building up over time, and how that change can possibly make that organism better in some way. If it helps the survival of an organism, that mutation is going to stick around and More >
Classic genetics alone is unable to explain the diversity we see within a population of living things. This also cannot explain how identical twins with the same DNA sequences can have differences in their traits and development of disease. First introduced in 1939 by C.H. Waddington, epigenetics is now able to offer some explanation, as it studies the heritable changes in gene expression that are not due to any alteration in the DNA sequence.
This may help to answer many questions. How can we have so many different types of cells and they all carry the same genetic information? How is More >
When we think about all of the living things on Earth, we immediately see how different we all are from each other. Many of these traits that might seem bizarre to us, evolutionarily speaking, have a tremendous amount to do with the survival. Many traits have been selected for by the opposite sex, because it will help the passing on of their design information.
One very amazing example of this is the Widowbirds that live in the grasslands of southern and eastern Africa. During the non-mating season, the males and females look very similar to one another. Once breeding season begins, More >