Whether it is brand-new or years old, a mattress too soft for your comfort level may make for many restless nights. As long as the mattress is in good shape, there's no need to replace it to achieve the desired level of firmness.Instead, purchase a firm topper, slide a bed board beneath the mattress, or add extra support to the bed frame itself. sheet of plywood cut to the same size as the mattress offers support for a mattress that has lost some of its firmness. Slide the plywood between the mattress and box spring.
Human cells normally contain 23 pairs of chromosomes, for a total of 46 chromosomes in each cell (illustration). A change in the number of chromosomes can cause problems with growth, development, and function of the bodyâs systems.
The different types of human chromosome disorders that are caused by a change in the number of chromosomes include Down syndrome, Patau syndrome, Edward's syndrome, Klinefelter syndrome and Turner's syndrome.f the cell has one copy of a chromosome, it is called a monosomic cell. Nondisjunctions in human cells are relatively common. The results are often lethal to the fetus, so it usually doesn't survive. There are several of these types of chromosome disorders that do not prevent the baby from being born, however.