What are the differences between onion and whitefish cells?
The events associated with these phases are the same in both onion and whitefish blastula cells. But the difference in the mitosis in them is that plant cell or onion cells lack the centrioles but the whitefish cells possess them which form the mitotic spindles in them.
What are the similarities between the two types of cells onion and whitefish?
Answer Expert Verified Basic similarities of onion cell and that of whitefish embryo cell is that in the four phase of mitosis namely, Prophase, Metaphase, Anaphase and Telophase occurs in similar way.
What do Whitefish blastula cells and Allium root tip cells have in common?
O Both Whitefish Blastula and Allium Root Tip cells have multiple nuclei and therefore we can see all stages of Mitosis in one cell. They are not actively dividing because the organism is no longer growing. The Blastula is a stage of embryonic development and embryos grow rapidly as a result of mitosis.
What differences do you notice between the onion root tip cells and the Whitefish blastula cells?
The onion root tips have the highest percentage of cells going through mitosis. The whitefish blastula is formed directly after the egg is fertilized. Cytokinesis then may occur forming a cleavage furrow and then the two daughter cells will separate. Meiosis is more complex and involves two nuclear divisions.
Why is onion root tip Whitefish blastula?
The whitefish embryo is a good place to look at mitosis because these cells are rapidly dividing as the fish embryo is growing. The onion root is also a good place because this is the area where the plant is growing. Remember that when cells divide, each new cell needs an exact copy of the DNA in the parent cell.
Why is onion root tip used for mitosis?
Why is onion root tip used to demonstrate mitosis in this experiment? It is because of the meristematic cells that are situated in the tip of the roots that render the most desirable and suitable raw material to study the different stages of mitosis. Hence, their root tips are used.
What is the longest phase in mitosis?
Why HCL is used in mitosis experiment?
Considering this, why HCL is used in mitosis experiment? 4 – the purpose of the hydrochloric acid is to destroy the substances that unite the cells (usually pectin), but it does not destroy the cell walls. The hydrochloric acid also has the ability to kill the cells and halt the process of mitosis.
Why is Allium good for studying mitosis?
Why is a sample from the roots of Allium spp. a good specimen for studying mitosis? Cells are actively growing so it is easy to find cells in various stages of mitosis. Interphase, cells spend most time of the cell cycle in this stage so is inevitable that many cells in a root tip will be in interphase.
What is onion bulb?
The onion plant has a fan of hollow, bluish-green leaves and its bulb at the base of the plant begins to swell when a certain day-length is reached. The bulbs are composed of shortened, compressed, underground stems surrounded by fleshy modified scale (leaves) that envelop a central bud at the tip of the stem.
How many chromosomes are there in each stage of mitosis in onion?
What is the difference between the prophase of mitosis and meiosis?
Prophase I Thus, when meiosis starts, there are two copies of each chromosome, attached as sister chromatids in the same chromosome. During prophase I, the chromosomes condense, as in mitosis. Unlike in mitosis, the sister chromosomes stay together through meiosis I, but the homologous chromosomes are separated.
What are the 2 main functions of meiosis?
Two key functions of meiosis are to halve the DNA content and to reshuffle the genetic content of the organism to generate genetic diversity among the progeny.
What kind of cells are made in meiosis?
Meiosis is a type of cell division that reduces the number of chromosomes in the parent cell by half and produces four gamete cells. This process is required to produce egg and sperm cells for sexual reproduction.
Why is meiosis important for reproduction?
Meiosis is important because it ensures that all organisms produced via sexual reproduction contain the correct number of chromosomes. Meiosis also produces genetic variation by way of the process of recombination.
What would be the main problem with reproduction of meiosis?
What would be the main problem with reproduction if meiosis did not take place to form sex cells? The zygote would have two nuclei. Fertilization would result in a zygote with half as many chromosomes as the parents. Fertilization would result in a zygote with twice as many chromosomes as the parents.
What would happen if there was no meiosis?
Where there are no meiosis means no gamete formation then no fertilization. On absence of meiosis cells will end up to divide my mitosis ie to increase in numbers but will not qualify to be gamete then sexual reproduction will stop.
What would happen after fertilization if meiosis did not occur?
If meiosis does not occur properly, an egg or sperm could end up with too many chromosomes, or not enough chromosomes. Upon fertilization, the baby could then receive an extra chromosome, or have a missing chromosome.
What would be the consequence of fertilization without meiosis?
Because meiosis creates cells that are destined to become gametes (or reproductive cells), this reduction in chromosome number is critical — without it, the union of two gametes during fertilization would result in offspring with twice the normal number of chromosomes!