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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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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 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.


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.