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.
Using an example, explain how a small change in a person's DNA can cause a genetic disorder. In both cystic fibrosis and sickle cell disease, a small change in the DNA of a single gene affects the structure of a protein, causing a derious genetic disorder. î î î. î î. karyotype. sex chromosome. autosome. pedigree. polygenic. sex-linked gene. nondisjunction. DNA fingerprinting. What are sex chromosomes? What determines whether a person is a male or female? Using an example, explain how a small change in a person's DNA can cause a genetic disorder. How does studying genetic disorders such as PKU help ... Wh