Name: DNA as the genetic material
Uploaded: 2023-07-21
Duration: 1 min 18 s
Description: DNA, or deoxyribonucleic acid, is the hereditary material in humans and almost all other organisms..

[Audio] DNA, or deoxyribonucleic acid, is the hereditary material in humans and almost all other organisms.. 

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Process by which DNA makes copies of itself to yield identical double stranded daughter DNA molecules

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Imagine yourself in 1953  ( The discovery of DNA double helix by James  Watson and Francis Crick ), after the double helix structure of DNA has just been  discovered.  What burning questions might be on your mind, and on the minds of other scientists ? It seemed likely that the two complementary strands of the helix might separate during replication, each serving as a  template  for the construction of a new, matching strand.

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Before the structure of DNA was known, scientists wondered at the ability of organisms to create faithful copies of themselves ……………. Thoughts about these issues centered around the concept of a  template………  Before Watson and Crick described DNA’s structure, DNA was identified as the genetic material

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HOW IS DNA REPLICATED (Copied)? Watson & Crick’s model suggested TEMPLATE mechanism

Parental (old)
DNA molecule
Daughter
(new) strand
Daughter
DNA molecule
(double helices)

DNA Replication   is   semi-conservative :         Each daughter cell  will have one old strand (the template), and one new strand (the copy).

DNA as the genetic material 

DNA, or deoxyribonucleic acid, is the hereditary material in humans and almost all other organisms.

DNA as the genetic material

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