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Chromosomes can be observed during the cell cycle primarily during the stages of mitosis and meiosis, specifically in prophase, metaphase, anaphase, and telophase. In these stages, chromosomes condense and become distinctly visible under a light microscope. Outside of these stages, during interphase, chromosomes are less visible as they are in a more relaxed, uncoiled state known as chromatin. However, they are still present and replicating during the S phase of interphase.
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What happen in a cell if production of cyclin is halted during a cell cycle?
If production of cyclin is halted during a cell cycle, the cell cycle will be arrested at a specific checkpoint until the levels of cyclin are restored. Cyclins are proteins that regulate the progression of the cell cycle by binding to cyclin-dependent kinases (CDKs). Without cyclin to bind to CDKs and activate them, the cell will not be able to progress through the cell cycle.
Why is it necessary for chromatin to condense into tightly packed chromosomes?
DNA does not condense into chromosomes. When cells divide so do chromosomes. Each chromosome provides the template for a new chromosome. The four bases match those on the old chromosomes and create new chromosomes. DNA does not just decide to get together, "Hey guys, lets get together and become a chromosome." ACTUALLY they do condense into chromosomes because it would be too big (if uncoiled and stretched out) to fit into a cell
After fertilization, how much of the chromosomes of both the sperm cell and the egg cell does the zygote have?
The zygote would be diploid because the sex cell would have 46 chromosomes instead of 23 (2n instead of n) and the chromosomes would keep on multiplying in each generation. Ex: child would have 92 chromosomes and that child's child would have 184, etc-Anonymous Mamba
What would happen if the spindle fibers did not form in a cell that is undergoing mitosis?
If spindle fibers failed to form in a cell during division, both daughter cells would become non-viable shortly after division. The spindle fibers pull one set of chromosomes into each of the daughter cells, so without them there cannot be an equal division of genetic material.
What happens if a cell was inhibited during the s phase of its cycle?
If a cell is inhibited during the S phase of its cycle, it will not be able to replicate its DNA. This can lead to issues during cell division, as daughter cells may not receive the correct amount of genetic material. Ultimately, it may result in cell death or abnormal growth.
Why are all chromosomes condense during all stages of the cell cycle?
When replicating or during transcription, DNA needs to uncoil in order to give the proper code. When the chromosomes are condensed, it cannot uncoil itself to give any sort of message. In order for the cell to remain functional, it must be able to code DNA.
What does fertile your period mean?
I believe that you mean your fertile period, this means the time during your menstrual cycle that you are able to get pregnant. During a typical 28 day cycle a woman would be fertile from day 7-16.
Do chromosomes double in mitosis?
No, chromosomes do not double in mitosis. Instead, the existing chromosomes are replicated during the S phase of the cell cycle, resulting in two identical sister chromatids for each chromosome. During mitosis, these sister chromatids are separated to form two new daughter cells with the same number of chromosomes as the parent cell.
Which cells have only 23 unpaired chromosomes?
The only place you would be able to find a cell with 23 chromosomes would be in the sex cells (sperm cells of egg cells). There are 46 chromosomes in the human body. This is because when a sperm cell fertilises the egg cell, both with 23 single chromosomes, they join to make 46.
Mitosis could not proceed if a mutation interrupted the assembly of?
the spindle fibers. Spindle fibers are essential for separating the chromosomes during cell division. Without proper spindle formation, the chromosomes would not be able to align and segregate correctly between the two daughter cells.
Why are the chromosomes not condensed during all stages of mitosis?
When replicating or during transcription, DNA needs to uncoil in order to give the proper code. When the chromosomes are condensed, it cannot uncoil itself to give any sort of message. In order for the cell to remain functional, it must be able to code DNA.
When does a cell copy its DNA?
The chromosomes are replicated so they are able to be split into daughter cells through the cell cycle.
What happen in a cell if production of cyclin is halted during a cell cycle?
If production of cyclin is halted during a cell cycle, the cell cycle will be arrested at a specific checkpoint until the levels of cyclin are restored. Cyclins are proteins that regulate the progression of the cell cycle by binding to cyclin-dependent kinases (CDKs). Without cyclin to bind to CDKs and activate them, the cell will not be able to progress through the cell cycle.
At which stage is its life cycle is a butterfly able to produce offspring?
A butterfly is able to produce offspring during the adult stage of its life cycle. This is when they are fully developed and capable of mating and reproducing.
Why is it necessary to regenerate RuBP during the Calvin Cycle?
Regenerating RuBP during the Calvin Cycle is necessary because RuBP is the molecule that captures carbon dioxide from the atmosphere and initiates the process of carbon fixation. Without regenerating RuBP, the Calvin Cycle would not be able to continue and produce glucose, which is essential for plant growth and energy production.
Why is it necessary for chromatin to condense into tightly packed chromosomes?
DNA does not condense into chromosomes. When cells divide so do chromosomes. Each chromosome provides the template for a new chromosome. The four bases match those on the old chromosomes and create new chromosomes. DNA does not just decide to get together, "Hey guys, lets get together and become a chromosome." ACTUALLY they do condense into chromosomes because it would be too big (if uncoiled and stretched out) to fit into a cell
What does it mean when two sets of chromosomes are homelogous?
It means the chromosomes are able to align at mitosis and meiosis but do not share the same origin. for example if an orange and a lemon tree were cross pollinated, the chromosomes would be homelogous( if of course this interaction was viable )
