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Cell cycle and Reproduction - River Dell Regional School District
Cell cycle and Reproduction - River Dell Regional School District

Module 3 Nature vs. Nurture
Module 3 Nature vs. Nurture

... make up a chromosome Chromosome – Threadlike structures made of DNA molecules that contain genes (46 total, 23 from each parent) DNA (deoxyribonucleic acid) – complex molecule that contains genetic information that makes up chromosomes Cell -> Nucleus -> Chromosomes -> DNA -> Genes ...
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Chapter 3-1 • Definitions: - Genetics: the scientific study of heredity

... chromosomes fail to separate correctly resulting in too many or too few chromosomes.  Mutations can cause genetic variety.  Some mutations are harmful resulting in less chance of survival or reproduction; others are helpful resulting in more chance of survival or reproduction; others are neutral. ...
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Extrachromosomal DNA



Extrachromosomal DNA is any DNA that is found outside of the nucleus of a cell. It is also referred to as extranuclear DNA or cytoplasmic DNA. Most DNA in an individual genome is found in chromosomes but DNA found outside of the nucleus also serves important biological functions.In prokaryotes, nonviral extrachromosomal DNA is primarily found in plasmids whereas in eukaryotes extrachromosomal DNA is primarily found in organelles. Mitochondrial DNA is a main source of this extrachromosomal DNA in eukaryotes. Extrachromosomal DNA is often used in research of replication because it is easy to identify and isolate.Extrachromosomal DNA was found to be structurally different from nuclear DNA. Cytoplasmic DNA is less methylated than DNA found within the nucleus. It was also confirmed that the sequences of cytoplasmic DNA was different from nuclear DNA in the same organism, showing that cytoplasmic DNAs are not simply fragments of nuclear DNA.In addition to DNA found outside of the nucleus in cells, infection of viral genomes also provides an example of extrachromosomal DNA.
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