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What is the difference between DNA, chromosomes and genes?  I am confused because I...

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najnim | Student, Grade 10 | eNotes Newbie

Posted May 2, 2012 at 7:19 PM via web

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What is the difference between DNA, chromosomes and genes?

 

I am confused because I don't know if chromosome is made of DNA or DNA is made of chromosomes. Where does a gene come into this.

Please make your answers simple a spossible for me to undersatnd. Thank you.

 

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yolo-x | (Level 1) eNoter

Posted May 2, 2012 at 7:28 PM (Answer #1)

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Chromosomes are organized structures of DNA and proteins that are found in cells. A chromosome is a singular piece of DNA, which contains many genes, regulatory elements and other nucleotide sequences. Chromosomes also contain DNA-bound proteins, which control its functions.

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trophyhunter1 | College Teacher | (Level 3) Senior Educator

Posted May 3, 2012 at 2:59 AM (Answer #2)

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A chromosome is a structure that is made of a chemical known as deoxyribonucleic acid, or DNA as well as protein. Chromosomes are found in the nucleus of cells. Chromosomes contain many genes. A gene is a molecular unit of heredity.  Each gene codes for a polypeptide, which becomes a protein that performs a function in a living thing. The DNA molecules are very long and in order to fit inside the nucleus of a cell, they are highly coiled and condensed. During sexual reproduction, one haploid set of chromosomes is given to the offspring from each parent, forming a diploid amount of chromosomes in the offspring. Since chromosomes contain all of our genes, an organism that reproduces sexually gets a combination of genes from both parents. Genes that are expressed produce an organism's phenotype.

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