Why do chromosomes become visible?
During interphase (1), chromatin is in its least condensed state and appears loosely distributed throughout the nucleus. Chromatin condensation begins during prophase (2) and chromosomes become visible.
Can chromosomes be seen with a light microscope?
During most of the cell cycle, interphase, the chromosomes are somewhat less condensed and are not visible as individual objects under the light microscope. However during cell division, mitosis, the chromosomes become highly condensed and are then visible as dark distinct bodies within the nuclei of cells.
What is the relationship between chromatin and chromosomes?
Chromatin Chromatin is a substance within a chromosome consisting of DNA and protein. The DNA carries the cell’s genetic instructions. The major proteins in chromatin are histones, which help package the DNA in a compact form that fits in the cell nucleus.
Why are chromosomes visible during mitosis?
Chromosomes are not visible in the cell’s nucleus—not even under a microscope—when the cell is not dividing. However, the DNA that makes up chromosomes becomes more tightly packed during cell division and is then visible under a microscope.
What happens to chromosomes during mitosis?
Mitosis is the process of nuclear division, which occurs just prior to cell division, or cytokinesis. During this multistep process, cell chromosomes condense and the spindle assembles. Each set of chromosomes is then surrounded by a nuclear membrane, and the parent cell splits into two complete daughter cells.
Why does mitosis happen?
Mitosis is a process where a single cell divides into two identical daughter cells (cell division). During mitosis one cell? divides once to form two identical cells. The major purpose of mitosis is for growth and to replace worn out cells.
What are 3 purposes of mitosis?
Mitosis is important for three main reasons: development and growth cell replacement and asexual reproduction.
What happens if mitosis goes wrong?
If the process of mitosis goes wrong, it usually happens in a middle phase of mitosis called metaphase, in which the chromosomes move to the center of the cell and align in an area called the metaphase plate. These mutations can lead to harmful results such as cell death, organic disease or cancer.
Which stage of mitosis is the quickest?
The metaphase plate is an imaginary line equidistant from the spindle’s 2 poles. In anaphase, the shortest stage of mitosis, the sister chromatids break apart, and the chromosomes begin moving to opposite ends of the cell.
Which stage of mitosis is the shortest Why?
Anaphase
What are the 4 phases of mitosis in order?
These phases are prophase, prometaphase, metaphase, anaphase, and telophase. Cytokinesis is the final physical cell division that follows telophase, and is therefore sometimes considered a sixth phase of mitosis.
What is the correct order of the cell cycle?
The correct order of the cell cycle is G1, S, G2, M and possible exit into G0.
Which sequence of stages in mitosis is correct?
Stages of mitosis: prophase, metaphase, anaphase, telophase. Cytokinesis typically overlaps with anaphase and/or telophase. You can remember the order of the phases with the famous mnemonic: [Please] Pee on the MAT.
What sequence of stages in mitosis is correct quizlet?
What is the correct order of mitosis? prophase, prometaphase, metaphase, anaphase, telophase, and cytokinesis.