non-sister chromatids: chromatids of a homologous chromosomes pair that are NOT sisters (one from each homologous chromosomes) sister chromatids: the two copies of an individual chromosome generated by DNA replication. duplicated (replicated) chromosome: one pair of sister chromatids.
What are non-sister chromatids?
Non-sister chromatids are also called as homologues. They are chromosome pairs having the same length, staining pattern, centromere position as well as the same characteristics of genes at particular loci. Non-sister chromatids are created during meiotic cellular division.
What are sister chromatids quizlet?
What are sister chromatids? Sister chromatids are duplicated copies of a single chromosome that are attached to each other and are identical. Meiosis. type of cell division that produces 4 cells, each w/ half the # of chromosomes as the parent cell; occurs in sex organs.
What is it called when non-sister chromatids exchange genes?
An exchange of chromosome segments between non-sister homologous chromatids occurs and is called crossing over. The crossover events are the first source of genetic variation produced by meiosis. … The result is an exchange of genetic material between homologous chromosomes.
What do you mean by sister chromatids?
Medical Definition of sister chromatid
: either of the two identical chromatids that are formed by replication of a chromosome during the S phase of the cell cycle, are joined by a centromere, and segregate into separate daughter cells during anaphase.
What are sister chromatids made of?
The sister chromatids are pairs of identical copies of DNA joined at a point called the centromere. Then, a structure called the mitotic spindle begins to form. The mitotic spindle is made of long proteins called microtubules that begin forming at opposite ends of the cell.
What happens if both sister chromatids move to the same pole?
The first round of chromosome segregation (meiosis I) is unique in that sister chromatids move together to the same spindle pole while homologous chromosomes move apart from each other to the opposite poles. … This leads to the formation of chiasmata, which maintain homolog association until the onset of anaphase I.