Researchers studying cell cycle regulation in budding yeast have observed that a mutation in the COC15 gene causes cell cycle arrest in telophase when the yeast cells are incubated at an elevated temperature. Which of the following statements best predicts the effect of the cell cycle arreston proliferating yeast cells? A. The yeast cells will transition out of G, but will fail to complete the G, phase. B. The yeast cells will initiate mitosis but will fail to complete the G, phase. C. The yeast cells will replicate their chromosomes but will fail to complete cytokinesis D. The yeasts will replicate their organelles but will folto complete the Sphase

Explanation:

1. Cell cycle completes in two phases; i) inter-phase and ii) mitotic phase.

2. Inter-phase is further divided into G1, S, and G2 phase,

DNA (chromosome) replication occurs in S phase.

3. Mitotic phase further divide into; prophase, metaphase, anaphase and telophase.

4. Cytokinesis ( cytoplasm division) occurs after telophase.

5. As given here cell cycle arrest in telophase, it means that the yeast cells will replicate their chromosomes  because it occurs in S phase but will fail to complete cytokinesis.

interphase

the period of cell growth when the cell synthesizes new molecules and organelles. the cell is not dividing and it constitutes the majority of the time spent in the cell cycle

prophase

changes occur in the nucleus and cytoplasm. the chromatin condenses to form structures (sister chromatids) visible with a light microscope and the mitotic spindle begins to form, but the nucleus is still in tact

prometaphase

the nuclear envelope fragments and the spindle microtubules attach to the kinetochores of the sister chromatids

metaphase

all the cell's duplicated chromosomes are lined up at an imaginary plane equidistant between the poles of the mitotic spindle

anaphase

begins when sister chromatids separate from each other and ending when a complete set of daughter chromosomes arrives at each of the two poles of the cell

telophase

the daughter nuclei form at the two poles of a cell

cytokinesis

the division of a cytoplasm to form two separate daughter cells. usually occurs during telophase during mitosis. this and mitosis make up to mitotic (m) phase of the cell cycle