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.
This can happen with any of the autosomal chromosomes (1 to 22) or the sex chromosomes (X and Y). If one extra complete chromosome is present, this is known as TRISOMY and the number of chromosomes in each affected cell would be 47.Probably the most well-known example of Trisomy is Down Syndrome (Trisomy 21).embers of each pair of chromosomes are called HOMOLOGOUS chromosomes. The first 22 pairs of chromosomes are called the AUTOSOMES and are numbered from 1 to 22 according to their length, starting with number 1 as the longest.