In the nucleus of each cell, the DNA molecule is packaged into thread-like structures called chromosomes. Each chromosome is made up of DNA tightly coiled many times around proteins called histones that support its structure.
Chromosomes are not visible in the cell’s nucleus—not even under a microscope—when the cell is not dividing. However, the DNA that makes up chromosomes becomes more tightly packed during cell division and is then visible under a microscope. Most of what researchers know about chromosomes was learned by observing chromosomes during cell division.
Those mutated genes are most commonly recessive. Females have two X chromosomes so they can have a chromosome with the mutated gene and one with the healthy gene. The healthy gene is dominant so the disease won't manifest, and the woman is only a carrier. Males have only one X chromosome and an Y chromosome. If they have the mutated gene on the X chromosome they won't have another X chromosome with the healthy gene.
To summarize, men can't be carriers and they only need one copy of the mutated X-linked gene while women need two copies of the mutated gene.
Hey :) hope your day is going well. :P I listed some information below, that may or may not help!
<em>"Evaluate the following statements. volcanoes are only found along coastlines."</em>
<u><em>False!</em></u>
<em><u>Most are found along plate boundaries and hot-spots. :) </u></em>
They are found along plate boundaries because when the plate's collide together, <u>they may leave cracks</u> behind and may turn later into small hills and eventually grow even larger as time goes, and <u>produce magma from under the earth's layers</u>.
Hope this helped you, and as always remember if you need any more help, mssg me and i'll answer any questions you may have. <u>Have a great day. :)</u>
Plant cells have all of these, but only a plant cell has a chloroplast.
Cancer cells can arise in a variety of ways, the most common, however, tends to be genetic mutations.
Genetic mutations can occur during the life of a cell due to outside factors such as:
- The <u>food </u>we eat
- The <u>environment </u>we expose the cell to
- The <u>substances </u>that touch the cell (e.g skin cells)
That being said, the most common time for a genetic mutation to take place is during cellular division. During this time the DNA that encodes the cells is duplicated. Genetic mutations in this DNA sometimes cause the elimination of <u>programmed cell death</u>.
<u>Programmed cell death </u>is what tells a cell when it should stop growing and dividing. This is a <u>regulatory function </u>designed to keep the number of cells at a balance, growing only when needed. As this cell multiplies, this produces an increasing number of cells that will not die. The <u>accumulation </u>of these cells is referred to as cancer.
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