Question

If you fuse a G1 cell to a cell in the M phase, which of the following responses will occur?

-The nucleus from the G1 cell will start to replicate its DNA.

-The M phase nucleus will undergo premature chromosomal condensation to form a set of compacted chromosomes

-The G1 nucleus will undergo premature chromosomal condensation to form a set of compacted chromosomes.

-The G1 nucleus will initiate DNA synthesis, and the M phase nucleus will stop chromosome condensation.

-The M phase nucleus will be affected in such a way that its compacted chromosomes decondense.

Answer 1

When a G1 cell is fused with an M phase cell, the G1 nucleus will undergo premature chromosomal condensation into compacted chromosomes due to the mitotic environment of the M phase cell.

Step-by-step explanation:

If you were to fuse a G1 cell with a cell in the M phase, the response that will occur is the G1 nucleus will undergo premature chromosomal condensation to form a set of compacted chromosomes. In this experimental scenario, the G1 nucleus is exposed to the mitotic environment of the M phase cell, which contains factors that induce condensation. Hence, the G1 nucleus prematurely condenses its chromatin into the more compact form observed during mitosis, even though it has not replicated its DNA.

This process of inducing a condensed state is informative in studies of cell cycle control and chromosomal dynamics and does not lead to DNA replication in the G1 nucleus. Instead, it demonstrates the dominance of the mitotic cell's cytoplasmic environment over the nuclear state of the G1 cell.