Mendel and the Discovery of DNA
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Questions and Answers

The ______ Experiment was pivotal in understanding DNA structure.

Hershey-Chase

Chargaff's rules highlight the equal amounts of ______ and thymine in DNA.

adenine

Rosalind Franklin used ______ diffraction to study DNA.

X-ray

The Watson-Crick model of DNA describes its structure as a ______ helix.

<p>double</p> Signup and view all the answers

Avery's experiment was a significant step in confirming that ______ is the material of heredity.

<p>DNA</p> Signup and view all the answers

Study Notes

Gregor Mendel and Heredity

  • Gregor Mendel established the fundamental principles of heredity.

Avery's DNA Experiment

  • In 1944, Oswald Avery duplicated Frederick Griffith's experiment.
  • Their goal was to identify the molecule in heat-killed bacteria responsible for transferring genetic information (transformation).

Chargaff's Rules

  • Erwin Chargaff's research revealed that each species has a unique DNA nucleotide percentage.
  • Within a species, the amounts of adenine and thymine nucleotides are equal, and the amounts of guanine and cytosine nucleotides are equal.

Hershey-Chase Blender Experiment

  • Alfred Hershey and Martha Chase used a blender to identify DNA as genetic material.
  • They used bacteriophages (viruses that infect bacteria), specifically T2.

Rosalind Franklin's X-Ray Diffraction

  • Rosalind Franklin used X-ray crystallography to study DNA structure.
  • She found two forms of DNA: Type A (dry) and Type B (wet).
  • Photo 51 was a key X-ray diffraction image taken in 1952.

Watson-Crick DNA Model

  • Watson and Crick published the first model describing DNA's double helix structure.
  • Their model illustrated DNA's double-stranded nature.
  • They identified key features of this model: Turning clockwise, antiparallel backbones, and nitrogenous bases positioned inside the helix.
  • The distance between bases in the helix is 3.4 angstroms.

Additional DNA Structure Details

  • Adenine pairs with thymine using two hydrogen bonds, and guanine pairs with cytosine using three.
  • There are 10 bases for every 360-degree turn.
  • A complete turn has 34 angstrom units.
  • The double helix has a 20-angstrom diameter.
  • DNA replication is semiconservative.

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Description

Explore the groundbreaking contributions of Gregor Mendel and key experiments in DNA research by scientists like Avery, Chargaff, Hershey, and Franklin. This quiz covers the foundational principles of heredity and the identification of DNA as genetic material, highlighting significant experiments that shaped genetics.

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