How are sister chromatids connected to each other quizlet?
Sister chromatids are held together at the centromere by kinetochore proteins. Sister chromatids are formed during the S phase of the cell cycle. Sister chromatids separate during telophase. Sister chromatids separate during telophase.
What holds a sister chromatid together?
Cohesin holds sister chromatids together after DNA replication until anaphase when removal of cohesin leads to separation of sister chromatids. The complex forms a ring-like structure and it is believed that sister chromatids are held together by entrapment inside the cohesin ring.
Which of the stages listed have sister chromatids connected at the centromere quizlet?
Sister chromatids are attached to one another at the centromere. e. Sister chromatids form in the S-phase stage of the cell cycle. Both of the sister chromatids end up in the same daughter cell after cytokinesis has occurred.
What pulls the sister chromatids apart during anaphase?
During anaphase, the microtubules attached to the kinetochores contract, which pulls the sister chromatids apart and toward opposite poles of the cell (Figure 3c). At this point, each chromatid is considered a separate chromosome.
What enzyme causes sister chromatids to separate?
The separation of sister chromatids is regulated by ubiquitin-mediated proteolysis, via three protein complexes, E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3 (ubiquitin ligase). E3 is also called the anaphase-promoting complex or cyclosome (APC/C) in S.
What happens during prophase I?
During prophase I, homologous chromosomes pair and form synapses, a step unique to meiosis. The paired chromosomes are called bivalents, and the formation of chiasmata caused by genetic recombination becomes apparent. Chromosomal condensation allows these to be viewed in the microscope.
What happens in metaphase I?
At metaphase I, the homologous chromosomes move to the center of the cell and orient themselves along an equatorial plane, forming the so-called metaphase plate.