Question

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

Answer 1

Answer:

C

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.