The Lyon hypothesis states that in cells with multiple X chromosomes, all but one is inactivated during mammalian embryogenesis. X-inactivation leads to clumped chromatin termed Barr bodies, which are generally considered inert. This formation of Barr bodies is called Lyonization. In humans the X chromosome that is inactivated is determined by chance. In marsupials, however, the paternal X chromosome is always inactivated. Inactivation is achieved by methylation of the X chromosome DNA, a common way in which the cell silences particular genes. Certain animals have their coloring patters dictated by this phenomenon. For example, female Calico cats have unique patterns of fur due to certain areas where different X chromosomes are inactived. The X chromosomes that are activated express different coloring genes and lead to their mosaic fur color. However, there are now reports that women still express many genes from their inactive X chromosomes, and that different women express different genes from the inactive X. Research by Carrel and Willard (2005) indicates that 15% of the genes on the inactive X chromosome are actually active across all women, and a further 10% of genes were switched on in some women. The hypothesis was first stated by Mary F. lyon in 1961 while she was studying the genetic consequences of radiation exposure, and therefore bears her name.
If the organism is a multicellular eukaryote comprised of more than one cellular tissue than this would be expected.
A probiotic in the intestinal tract that aids in digestion.
Yes it is an example. There a positive feed back mechanism take place
it could be the habitat (the place in which an organism lives)... that is a guess so don't get mad at me if it isn't ;)
Niche: an organism's role in the environment. Habitat: specifically where it lives. For example, many organisms maybe have the same habitat (under a log, if we're considering insects), but as long as they occupy different niches, they will not be in competition.
release gas pressure, get to the pump mechanism under the back seat, replace the pump in the mechanism
Actually, yes they do! Any living organism, including one celled organisms, have a mechanism for getting rid of waste. If you look at a living amoeba under a microscope, every now and then you can see it leave a small particle of waste behind. This is amoeba poop!
Check with the dealership.
An organism is a living thing. It can be a micro-organism, which can only be seen under a microscope, a fungus, a plant or an animal.
Species (under the Biological Species Concept).
the lock mechanism is in the rear, right under the lock, all you do is take the slim Jim and push the mechanism down and forward.