More specifically, in the first part of anaphase — sometimes called anaphase A — the kinetochore microtubules shorten and draw the chromosomes toward the spindle poles.
Which phase of mitosis involves the shortening?
Anaphase A, the movement of the sister chromatids to the spindle poles, requires a shortening of the kinetochore fibers. During anaphase B, the spindle elongates, pushing the spindle poles apart.
Which phase of mitosis involves the shortening of the microtubules as the chromosomes move toward the poles quizlet?
-In metaphase, the kinetochore microtubules have attached each pair of sister chromatids, and the nonkinetochore microtubules overlap extensively at the metaphase plate. -During anaphase, the kinetochore microtubules shorten as the chromosomes move toward the poles of the cell.
What phase of the cell cycle letter would shortening of the microtubules occur?
Anaphase consists of two phases, anaphase A and B. During anaphase A, the chromosomes move to the poles and kinetochore fiber microtubules shorten; during anaphase B, the spindle poles move apart as interpolar microtubules elongate and slide past one another.
How can microtubules be shortened?
If this concept is correct, the spindle microtubules attached to the kinetochores of the sister chromatids, shorten by depolymerization (removal) of protein subunits at their polar ends. This would shorten the microtubule and “pull” on it, tugging the chromosome half towards that pole.
What is G1 and G2 phase?
G1 phase is the first phase of the interphase of the cell cycle in which cell shows a growth by synthesizing proteins and other molecules. G2 phase is the third phase of interphase of the cell cycle in which cell prepares for nuclear division by making necessary proteins and other components.
During what stage does G1 S and G2 phase happen?
Interphase is composed of G1 phase (cell growth), followed by S phase (DNA synthesis), followed by G2 phase (cell growth). At the end of interphase comes the mitotic phase, which is made up of mitosis and cytokinesis and leads to the formation of two daughter cells.
During which stage of mitosis do chromosomes move to the spindle equator prophase prometaphase anaphase metaphase?
During prophase, the nucleus disappears, spindle fibers form, and DNA condenses into chromosomes ( sister chromatids ). During metaphase, the sister chromatids align along the equator of the cell by attaching their centromeres to the spindle fibers.
What is meiosis Class 9?
Meiosis is the process in which a single cell divides twice to form four haploid daughter cells. These cells are the gametes – sperms in males and egg in females.
What is the role of microtubules in mitosis quizlet?
Kinetochore microtubules shorten—pull chromosomes to poles. Polar microtubules (aka non-kinetochore microtubules) lengthen—push spindle poles apart. Astral microtubules shorten—pull spindles apart. Separation of the genetic material is complete.