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.
Another example could be if mitosis does not get out of control with growth rate the cell can divide improperly and the cell can have an unusually number of chromosomes. Then, if this cell replicates more and more cells from it will have this odd number of chromosomes and a number of problems can ensue. Meiosis involves the replication of sex cells. If this process goes awry the sex cell can have an odd number of chromosomes and this can lead to numerous genetic disorders. For examples, three number 21 chromosomes yields Down Syndrome and an extra X chromosome for a male can make him sterile.