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DNA. Introduction to Agriculture, Food, and Natural Resources. Unit 4 – Lesson 4.1 Totally Cellular. The Nucleus. Eukaryote cells contain a nucleus that contain important organelle components and compounds required for cell replication. Florida State University (2010). Inside the Nucleus.

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Dna

DNA

Introduction to Agriculture, Food, and Natural Resources

Unit 4 – Lesson 4.1 Totally Cellular


The nucleus

The Nucleus

Eukaryote cells contain a nucleus that contain important organelle components and compounds required for cell replication

Florida State University (2010)


Inside the nucleus

Inside the Nucleus

Chromosomes

Nucleus

DNA


Chromosomes

Chromosomes

Chromosomes are found within the nucleus and contain DNA, which is the building block of genes.


Dna defined

DNA Defined

Deoxyribonucleic acid – double stranded nucleic acid molecule arranged as a double helix.

  • Main constituent of the chromosome

  • Carries the genes as segments along it’s strands

Encyclopedia Britannica, Inc.


Dna composition

DNA Composition

DNA is made up of:

  • Phosphoric acid

  • Deoxyribose (sugar)

  • Four nitrogen bases

    • Cytosine (C)

    • Thymine (T)

    • Adenine (A)

    • Guanine (G)

  • Hydrogen


Dna base pairing

DNA Base Pairing

DNA bases always combine as follows:

  • Cytosine (C) combines with Guanine (G)

  • Adenine (A) combines with Thymine (T)


Dna replication

DNA Replication

When cells divide, DNA strands must replicate.

  • Strands unwind

  • Base pairs detach

  • Each strand replicates forming two complete DNA strands


Gene combinations

Gene Combinations

Genes are “segments” DNA that define certain physical characteristics of living things.

Image from ADAM (2009)


Genetic inheritance

Genetic Inheritance

Genes are replicated as DNA is copied over and over to make new cells.

This replication process defines the physical traits of a living organism and passes on the genetic combinations to offspring during fertilization.


References

References

Lab-Aids Incorporated. (2005). The molecular model of DNA and its replication kit [Brochure]. Ronkonkoma, NY: Author.

Parker, R. (2010). Plant and soil science: Fundamentals and applications. Clifton Park, NY: Delmar.


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