Table of Contents
- 1 What happens if cells do not have the proper amount of DNA?
- 2 What happens if a daughter cell is missing a chromosome?
- 3 What would happen if each cell did not inherit a complete set of DNA?
- 4 What disease is caused by a missing chromosome?
- 5 Which is the shortest phase of mitosis?
- 6 What are the 4 stages of the cell cycle?
- 7 How is a daughter cell different from a clone?
- 8 How are chromosomes separated in a daughter cell?
What happens if cells do not have the proper amount of DNA?
Without DNA, cells could not reproduce, which would mean extinction of the species. Normally, the nucleus makes copies of chromosomal DNA, then segments of DNA recombine, and next the chromosomes divide twice, forming four haploid egg or sperm cells.
What happens if a daughter cell is missing a chromosome?
If nondisjunction causes a missing chromosome in a haploid gamete, the diploid zygote it forms with another gamete will contain only one copy of that chromosome from the other parent, a condition known as monosomy.
Which phase of the cell cycle has the least amount of DNA?
G1 phase
Only G1 phase precedes the S phase and has half the amount of DNA as the rest of the cell cycle; therefore, cells in the G1 phase have the least amount of DNA.
What happens when cytokinesis does not occur?
Usually, cytokinesis is the last phase in mitosis in which the contents of the cell (cytoplasm and nuclei) are divided over two separate, identical daughter cells. The result of mitosis without cytokinesis will be a cell with more than one nucleus. Such a cell is called a multinucleated cell.
What would happen if each cell did not inherit a complete set of DNA?
The cell’s DNA is copied during the synthesis phase. If the cell has not properly copied its chromosomes, an enzyme called cyclin dependent kinase, or CDK, will not activate the cyclin, and the cell cycle will not proceed to the next phase. The cell will undergo cell death.
What disease is caused by a missing chromosome?
Turner syndrome, a condition that affects only females, results when one of the X chromosomes (sex chromosomes) is missing or partially missing. Turner syndrome can cause a variety of medical and developmental problems, including short height, failure of the ovaries to develop and heart defects.
What is the most common disorder caused by a chromosomal deletion?
Some examples of more common chromosome deletion syndromes include cri-du-chat syndrome and 22q11.
Which is the shortest phase?
M phase
M phase is considered as the shortest phase in the cell cycle. G1 phase, S phase, G2 phase and M phase. The total time duration of a cell cycle is for 24 hours.
Which is the shortest phase of mitosis?
anaphase
In anaphase, the shortest stage of mitosis, the sister chromatids break apart, and the chromosomes begin moving to opposite ends of the cell.
What are the 4 stages of the cell cycle?
In eukaryotes, the cell cycle consists of four discrete phases: G1, S, G2, and M. The S or synthesis phase is when DNA replication occurs, and the M or mitosis phase is when the cell actually divides. The other two phases — G1 and G2, the so-called gap phases — are less dramatic but equally important.
What happens when cytokinesis fails permanently after repeated karyokinesis?
When cytokinesis fails permanently after karyokinesis in mitosis this results in multi nucleate condition when the cell does not divide where as the nucleus keep on dividing .
What does it mean when a cell becomes a daughter cell?
A “daughter cell” in this sense would mean that the cells are combining their genetics to create a new cell. In fact, the opposite is happening. In mitosis, a single cell becomes two identical cells. Daughter cells in this sense are actually closer to clones. In meiosis, a single cell becomes 4 cells, each with reduced DNA.
How is a daughter cell different from a clone?
A “daughter cell” in this sense would mean that the cells are combining their genetics to create a new cell. In fact, the opposite is happening. In mitosis, a single cell becomes two identical cells. Daughter cells in this sense are actually closer to clones.
How are chromosomes separated in a daughter cell?
As the cell enters the process of mitosis, the DNA condenses. It forms into densely packed chromosomes, which can be separated appropriately into the daughter cells. Spindle fibers, forming from the centrioles, reach out across the dividing cells and attach to various chromosomes, organelles, and other structures.
How many daughter cells are produced in meiosis?
After 48 hours, the cells each will have divided 4 times. But, each cell division produces two daughter cells, each of which will become a parent cell before dividing again. 2. Two students are arguing. One says that meiosis produces 4 daughter cells.
https://www.youtube.com/watch?v=GY8r4vDOcDQ