Examine the following diagrams of cells from an organism with diploid number 2n=6, and identify what stage of M phase is represented.

Key Concepts

M Phase

M Phase, or mitotic phase, is the stage of the cell cycle where cell division occurs. It includes both mitosis, the process of nuclear division, and cytokinesis, the division of the cytoplasm. Understanding M Phase is crucial for identifying the specific stage represented in the diagrams, as it encompasses several distinct phases: prophase, metaphase, anaphase, and telophase.

Diploid Number

The diploid number (2n) refers to the total number of chromosomes in a somatic cell, where chromosomes exist in pairs. In this case, 2n=6 indicates that the organism has six chromosomes, or three pairs. Recognizing the diploid number helps in understanding the genetic makeup of the organism and the implications for chromosome behavior during M Phase.

Chromosome Structure During M Phase

During M Phase, chromosomes undergo significant structural changes, becoming highly condensed and visible under a microscope. Each chromosome consists of two sister chromatids joined at the centromere. Identifying the arrangement and number of chromatids in the diagrams is essential for determining the specific stage of M Phase, as the appearance of chromosomes varies between prophase, metaphase, anaphase, and telophase.