DNA, or deoxyribonucleic acid, is the molecule that makes up an organismâs genome in the nucleus of every cell. It consists of genes, which are the molecular codes for proteins â the building blocks of our tissues and their functions.he percentage of genes or DNA that organisms share records their similarities. We share more genes with organisms that are more closely related to us. Humans belong to the biological group known as Primates, and are classified with the great apes, one of the major groups of the primate evolutionary tree.
exists and is an alternate of . Making the world better, one answer at a time. Sister chromatids are attached to each other in the part of the chromosome called the centromere. Sister chromatids are attached to each other in the part of the chromosome called the centromere.
When a single chromosome has been replicated (that is, copied), each copy is called a sister chromatid. When you see an 'X' representing genetic material in an illustration, you are seeing two sister chromatids held together by a special part of the chromosome called the centromere.herefore, when mitosis begins in a human body cell, its DNA consists of 46 chromosomes and 92 sister chromatids. The sister chromatids stay attached to their identical twin until the anaphase stage of mitosis. At this time, since they are no longer connected by a centromere, they are considered to be chromosomes.