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77julia77 [94]
3 years ago
11

Explain the process of mitosis in a tissue culture for normal cells.

Biology
2 answers:
Deffense [45]3 years ago
4 0

Answer:

Cell tissue is taken from a living organism.

Cells divide and reproduce in the culture.

Cells continue mitosis until they are touching, then they stop reproducing until a cell dies.

Cells reproduce one layer thick and then stop reproducing.

Cells undergo 20 to 50 mitotic divisions in a tissue culture.

Explanation:

timofeeve [1]3 years ago
3 0
Interphase-intermediate phase, DNA replicates

Prophase -coils into chromosomes, chromosomes are made of two chromatids, which join at the centromere at this stage.

Metaphase -Chromosomes line up in the middle of cell on spindles

Anaphase - Chromosomes are pulled apart to opposite ends of the cell by the spindles

Telophase - The cell splits into two cells, and the chromosomes uncoil and begin from the interphase stage again
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1. Some annelids are detritivores. Their main source of food comes from ?
aev [14]

Answer:

c. decaying plant and animal remains

7 0
3 years ago
How many chromosomes does a body cell for the organism (egg and sperm) have?
DiKsa [7]
Growth and repair
creation of gametes (sex cells)
method of reproduction in unicellular organisms
Binary Fission - type of reproduction that occurs in bacterial cells, single celled organism splits and becomes two identical organisms

Chromosomes and DNA

Chromosomes are DNA wrapped around proteins to form an X-shaped structure.



The diagram will help you see the relationship.

1. Chromosomes are found in the nucleus
2. Chromosomes are made of DNA
3. Sections of chromosomes are called genes



DNA - deoxyribonucleic acid (it is the genetic code that contains all the information needed to build and maintain an organism)





Chromosome Structure







Chromosome Numbers

Each organism has a distinct number of chromosomes, in humans, every cell contains 46 chromosomes. Other organisms have different numbers, for instance, a dog has 78 chromosomes per cell.

Somatic Cells - body cells, such as muscle, skin, blood ...etc. These cells contain a complete set of chromosomes (46 in humans) and are called DIPLOID.

Sex Cells - also known as gametes. These cells contain half the number of chromosomes as body cells and are called HAPLOID

Chromosomes come in pairs, called Homologous Pairs (or homologs). Imagine homologs as a matching set, but they are not exacly alike, like a pair of shoes.

Diploid cells have 23 homologous pairs = total of 46

Haploid cells have 23 chromosomes (that are not paired) = total of 23

Homologous Chromosomes



Sex Determination

Chromosomes determine the sex of an offspring. In humans, a pair of chromosomes called SEX CHROMOSOMES determine the sex.

If you have XX sex chromosomes - you are female

If you have XY sex chromosomes - you are male

During fertilization, sperm cells will either contain an X or a Y chromosome (in addition to 22 other chromosomes - total of 23). If a sperm containing an X chromosome fertilizes an egg, the offspring will be female. If a sperm cell containing a Y chromosome fertilizes an egg, the offspring will be male.

Creation of a Zygote

When two sex cells, or gametes come together, the resulting fertilized egg is called a ZYGOTE

Zygotes are diploid and have the total 46 chromosomes (in humans)

Karyotype

A karyotype is a picture of a person's (or fetus) chromosomes. A karyotype is often done to determine if the offspring has the correct number of chromosomes. An incorrect number of chromosomes indicates that the child will have a condition, like Down Syndrome

Compare the Karyotypes below













Notice that a person with Down Syndrome has an extra chromosome #21. Instead of a pair, this person has 3 chromosomes - a condition called TRISOMY (tri = three)

Trisomy results when chromosomes fail to separate - NONDISJUNCTION - when sex cells are created. The resulting egg or sperm has 24 instead of the normal 23.

Other conditions result from having the wrong number of chromosomes:

Klinefelters Syndrome - XXY (sex chromosomes)

Edward Syndrome - Trisomy of chromosome #13
4 0
3 years ago
How many arc seconds are in a degree
Andrews [41]
3600, PLEASE MARK AS BRAINLIEST!!!
3 0
3 years ago
Which is an example of the beneficial application of plants in human society? Plants used for food can cause deforestation. Plan
ira [324]

The correct option is this: PLANTS CAN BE USED TO MAKE MATERIALS.

Plants are very important living organisms and they can be used in diverse ways. Some plants can be used as foods, some plants are used as raw materials for making pharmaceutical drugs and other herbal products. Plants, such as cotton are used to make clothing materials and dead and decaying plants serves as fertilizer that add nutrients to the soil.

9 0
3 years ago
Read 2 more answers
Which one to choose ?(please tell me if u have trouble seeing)
Flura [38]
The best answer to choose would be — “Weak winds that blow for short periods of time with a short fetch.”

Few factors determinate size of surfing waves:

1The weaker the wind speed, the shorter the wave.

The shorter amount of time that the wind blows, the shorter the wave.


Concluding my statement, and in opposition to the answer, it is the stronger winds along with a long period of time those winds with a long fetch that will be able to make the biggest waves.
3 0
3 years ago
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