How many chromosomes do fish have?

Most fishes have between 40 and 60 chromosomes, with 48 a generally accepted number for some common ancestral fish. The evolution of the fishes, including the generation of new species, has principally involved the mechanisms of chromosome rearrange ment and chromosome duplication.

What is the diploid number of a white fish?

There was a diploid number of 50 chromosomes: Metacentrics (26M), Submetacentrics (16SM) and Subtelocentrics (8ST). The fundamental number is 100 arms.

How many cells are in Whitefish blastula?

26
Cathy Perrins observed 26 whitefish blastula cells. Three cells were in metaphase, 2 were in anaphase, 7 were in prophase, and 6 were in telophase. Assuming she assigned a cell cycle phase to each of the 26 cells, calculate the percent of the time the whitefish blastula cells spend in interphase.

What is Whitefish cell?

Metaphase Whitefish Blastula Cell. Cell Division – Mitosis – in Whitefish Blastula Cells. This cell is in very late stage of metaphase. The chromosomes are attached to the microtubules of the spindle and they are lined up across the equator of the cell in a circle that is perpendicular to cell’s long axis.

How many chromosomes are in a diploid cell?

In humans, cells other than human relationship cells, are diploid and have 23 pairs of chromosomes.

How many chromosome are there?

46
In humans, each cell normally contains 23 pairs of chromosomes, for a total of 46. Twenty-two of these pairs, called autosomes, look the same in both males and females. The 23rd pair, the relationship chromosomes, differ between males and females.

What is a Whitefish blastula?

Whitefish blastula is the early stage of embryo development of whitefish. The blastula is formed after an egg is fertilized and divides numerous times…

How did the dividing cells in the Whitefish blastula differ from the dividing cells in the onion root tip?

The root tip cells are actively dividing meristematic cells and mitosis can be observed in them very easily. … Whitefish blastula cells are used for studying mitosis. These cells are constantly dividing cells just like meristematic cells of plants.

How many chromosomes are visible in the beginning of mitosis?

46 chromosomes
After the genetic material is duplicated and condenses during prophase of mitosis, there are still only 46 chromosomes – however, they exist in a structure that looks like an X shape: For clarity, one sister chromatid is shown in green, and the other blue. These chromatids are genetically identical.

What happens in Whitefish anaphase?

Anaphase Whitefish Blastula Cell. In the photograph the arrow points to a cell in anaphase. The cells sister chromatids (B), now individual chromosomes, have separated from one another. … This process shortens the fibers and draws the chromosomes ever closer to the pole.

What is a Whitefish interphase?

Interphase Whitefish Blastula Cell. Cell Division – Mitosis – in Whitefish Blastula Cells. This cell is in the interphase stage of the cell cycle. Early in interphase the cell (A) reaches its full size and then starts preparing for its next division.

Do Whitefish interphase cells have a cell membrane?

Interphase and Mitosis in the Whitefish Blastula

These two low power micrographs contain numerous cells in the interphase (see )of the cell cycle. During the interphase the nuclear membrane is present and the nuclear content consists of the granular chromatin.

What are the stages of mitosis in Whitefish?

Virtual Mitosis Lab: Part II – Whitefish Blastula

Mitosis consists of 4 major stages: Prophase, Metaphase, Anaphase, and Telophase.

What stage of mitosis is the whitefish blastula cell in on slide 2?

Prophase
Prophase Whitefish Blastula Cell. The arrows (A) in the photo point to a cell in the prophase stage of mitosis. During this stage the chromosomes become visible, the nucleoli disappear, the nuclear membrane is broken down and the spindle begins to take form.

What happens anaphase?

During anaphase, each pair of chromosomes is separated into two identical, independent chromosomes. The chromosomes are separated by a structure called the mitotic spindle. … The separated chromosomes are then pulled by the spindle to opposite poles of the cell.

How are the chromosomes in each cell made visible?

Each chromosome is made up of DNA tightly coiled many times around proteins called histones that support its structure. … However, the DNA that makes up chromosomes becomes more tightly packed during cell division and is then visible under a microscope.

Why is Whitefish blastula?

To study mitosis, biologists often look at particular cells. … 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 do Whitefish blastula cells and Allium root tip cells have in common which make them good for illustrating mitosis?

Whitefish Blastula Anaphase Telophase Interphase Prophase Metaphase Both Whitefish Blastula and Allium Roots are plant cells and therefore have a thick cell wall, making viewing under a microscope very clear: Both Whitefish Blastula and Allium Root Tip cells have multiple nuclei and therefore we can see all stages of …