Why do all cells need their own copy of DNA?

DNA replication needs to occur because existing cells divide to produce new cells. Each cell needs a full instruction manual to operate properly. So the DNA needs to be copied before cell division so that each new cell receives a full set of instructions!

Why do all body cells have the same DNA?

Almost all of the cells in your body share the same DNA as was found in that first cell*. For a cell to work, 1000’s of these proteins must be made, each doing its particular job. Eyes and lungs are so different because different sets of proteins are made in the various eye and lung cells.

Why do we have two copies of each of the genes in our genome?

People usually have two copies of each chromosome. One copy is inherited from their mother (via the egg) and the other from their father (via the sperm). A sperm and an egg each contain one set of 23 chromosomes.

Do all cells have a complete set of DNA?

Deoxyribonucleic acid, more commonly known as DNA, is a complex molecule that contains all of the information necessary to build and maintain an organism. All living things have DNA within their cells. In fact, nearly every cell in a multicellular organism possesses the full set of DNA required for that organism.

Why do you think it is necessary for the cell to grow and duplicate its DNA before the start of meiosis?

DNA replicates before a cell divides to give a complete set of genetic instructions to each daughter cell. If a cell begins meiosis without duplicating its DNA, the two resulting cells would have insufficient DNA to develop properly, as there would only be one copy of each chromosome in the parent cell.

Do all cells have the same function?

No, all the cells in the body has various function to do . Like hepatic cells are associated with liver and chief cells with the stomach. Like blood have different cellular components like erythrocytes, leucocytes etc to do specific function .

Why do the cells in your body differ from each other?

The cells on your body differ from each other because they express different sets of –. Genes. Transcription factors bind to DNA and help RNA polymerase know where a gene –. A TATA box a promoter that is found on almost all — cells.

Does every gene have 2 copies?

Every person has two copies of each gene, one inherited from each parent. Most genes are the same in all people, but a small number of genes (less than 1 percent of the total) are slightly different between people. Alleles are forms of the same gene with small differences in their sequence of DNA bases.

How could be a cell with two copies of DNA?

Cells will duplicate or copy their DNA right before they divide. The process of cell division is called mitosis. Since the cell is dividing it needs two copies of its DNA – one is kept by the parent cell and the other is passed to the daughter cell.

Do all cells have a mitochondria?

Mitochondria are found in all body cells, with the exception of a few. There are usually multiple mitochondria found in one cell, depending upon the function of that type of cell. Mitochondria are located in the cytoplasm of cells along with other organelles of the cell.