THE MOLECULAR BASIS OF INHERITANCE
GENE MUTATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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each cell contains only the active parts of the DNA needed for that function
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each cell contains only the DNA needed for that function
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each cell has an identical copy of DNA with enzymes controlling the expression of specific genes
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each cell has multiple copies of DNA that are effected in different ways by the environment
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Detailed explanation-1: -Your amazing body contains hundreds of different cell types, from immune cells to skin cells to neurons. Almost all of your cells contain the same set of DNA instructions – so why do they look so different, and do such different jobs? The answer: different gene regulation!
Detailed explanation-2: -All of the cells within a complex multicellular organism such as a human being contain the same DNA; however, the body of such an organism is clearly composed of many different types of cells.
Detailed explanation-3: -Despite the fact heart cells and brain cells carry the same genes, how do these cells make different tissues and organs ? The key is that our cells possess a mechanism that regulate gene-expression during development without any changes of DNA sequences.
Detailed explanation-4: -Nearly every cell in a person’s body has the same DNA. Most DNA is located in the cell nucleus (where it is called nuclear DNA), but a small amount of DNA can also be found in the mitochondria (where it is called mitochondrial DNA or mtDNA).