In a deed restricted community, a homeownersâ association (HOA) enforces rules pertaining to how your property is used and what it looks like. Most deed restricted communities require an HOA fee that pays for the communityâs upkeep and maintenance.
DNA, chromosomes and genes. Every cell in your body contains DNA (deoxyribonucleic acid). DNA, the genetic code for your body, exists as two long, paired strands spiraled into a double helix called a chromosome. DNA is like a blueprint that tells your body how to grow and develop. Each cell contains two copies of each chromosome, one copy inherited from your mother through the egg and one from your father through the sperm.
1 Humans have 23 pairs of chromosomes. 2  An enormous number of genes lie in each chromosome strand. 3  Scientists say that a chromosome is a single piece of DNA which has many genes, regulatory elements and other nucleotide sequences (sequences of the letters ACGT). 4  A chromosome consists of DNA and has proteins attached to it.