why is an onion root tip good for studying mitosis?
Onion root tips are commonly used to study mitosis. They are sites of rapid growth, so the cells are dividing rapidly.
Why is it important to learn about mitosis? Mitosis is important because it is essential for growth and repair in the body. Mitosis happens when a parent cell divides, creating two identical copies, referred to as daughter cells. During this process, it is essential that the daughter cells are exactly the same with the same copies of DNA.
why was an onion root used for this lab?
An onion root tip is a rapidly growing part of the onion and thus many cells will be in different stages of mitosis. The onion root tips can be prepared and squashed in a way that allows them to be flattened on a microscopic slide, so that the chromosomes of individual cells can be observed easily.
How many chromosomes are visible at the beginning of mitosis?
why is the Whitefish Blastula a good specimen for studying mitosis?
Two specimens are commonly used by biologists to study mitosis: the blastula of a whitefish and the root tip of an onion. The whitefish embryo is a good place to look at mitosis because these cells are rapidly dividing as the fish embryo is growing.
What moves the chromatids during mitosis?
Metaphase leads to anaphase, during which each chromosome’s sister chromatids separate and move to opposite poles of the cell. More specifically, in the first part of anaphase — sometimes called anaphase A — the kinetochore microtubules shorten and draw the chromosomes toward the spindle poles.
Which mitotic phase was the easiest to find in the onion root?
What happens during prophase?
The first and longest phase of mitosis is prophase. During prophase, chromatin condenses into chromosomes, and the nuclear envelope, or membrane, breaks down. In animal cells, the centrioles near the nucleus begin to separate and move to opposite poles (sides) of the cell.
What stage of mitosis is the easiest to determine chromosome number?
In metaphase, all of the chromosomes have lined up in the center of the cell in preparation for separating in anaphase. Since they’re all lined up, they are easier to count.
How many chromosomes do whitefish have?
In a table in this book, there are 19 species of Whitefish listed, varying in chromosome number from 2N = 36 to 2N = 96, with some species even listed with different chromosome numbers among races!
Which stage of mitosis is the longest?
How many cells are in prophase in an onion root tip?
Let’s count the number of cells in some onion root tips during each phase, and use this information to answer the question. On this slide, there are 21 cells in interphase, 4 in prophase, 2 in metaphase, and 1 in telophase.
What is the purpose of mitosis?
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.
How do you make onion roots grow faster?
Obtain onion bulb, four toothpicks, small beaker (150mL), and enough water to fill the beaker to top. Hold the onion by the top, insert four toothpicks at perpendicular angles to suspend onion into the water. Wait two or three days for root tips to grow.