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.
A sister chromatid refers to the identical copies formed by the replication of a chromosome, with both copies joined together by a common centromere. In other words, a sister chromatid may also be said to be 'one-half' of the duplicated chromosome. A pair of sister chromatids is called a dyad. A full set of sister chromatids is created during the synthesis (S) phase of interphase, when all the chromosomes in a cell are replicated. The two sister chromatids are separated from each other into two different cells during mitosis or during the second division of meiosis. Compare sister chromatids to homologous chromosomes, which are the two different copies of a chromosome that diploid organisms (like humans) inherit, one from each parent.