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Warm Up Activity. Quietly work on the “counting chromosomal content” worksheet. (5 minutes). Question?. What does DNA code for?. ANSWER. The nitrogen bases found in DNA code for the proteins your body makes. Those proteins determine what traits you will have. (Eye color, hair color etc..).

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Warm Up Activity

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Warm Up Activity

Quietly work on the “counting chromosomal content” worksheet.

(5 minutes)


Question?

What does DNA code for?


ANSWER

  • The nitrogen bases found in DNA code for the proteins your body makes. Those proteins determine what traits you will have. (Eye color, hair color etc..)


Agenda

  • Chocolate chip cookie recipes

  • Notes on mutations

  • Mutations Worksheet


Crossing Over

Crossing Over = The exchange of genetic material between homologous chromosomes

occurs during meiosis and contributes to genetic variability


Let’s Review

  • Replication = copying DNA

  • DNA  Proteins  Traits

  • If the DNA is “wrong” it can make the wrong proteins which will code for the wrong traits.


  • Mutations of DNA = occurs during Replication of DNA or Cell Division


MUTATIONS DURING REPLICATION

  • Mutations in DNA will cause a change in Protein.

  • A change in the protein will cause a change in Traits. ex: hair color, eye color


There are different types of mutations:

  • Substitution

  • Insertion (sometimes repeated)

  • Deletion/omission


Example of Substitution

  • The/car/hit/the/cat

  • Substitute a p or the r

  • The/cap/hit/the/cat


Example of Insertion

  • The/car/hit/the/cat

  • Insert a letter

  • The/aca/rhi/tth/eca/t


Example of Deletion

  • The/car/hit/the/cat

  • Delete a letter

  • The/cah/itt/hec/at


  • These mutations cause:

  • harm: Change in the protein

  • benefit: Change in the protein

  • no effect: No change in the protein


MUTATIONS DURING CELL DIVISION

  • During Mitosis – mutations will effect body cells

  • During Meiosis – mutations have the potential to be passed on to offspring


Let’s Practice

  • Original strands:

    A C T C

    T G A G

  • After Replication:

    A C T C

    T G A G A

    What type of mutation is this?


  • Original strands:

    A C T C

    T G A G

  • After Replication:

    A C T C

    T G A T

    What type of mutation is this?


  • Original strands:

    A C T C

    T G A G

  • After Replication:

    A C T C

    T G A G T

    What type of mutation is this?


  • Overall, the organism is either harmed, benefits or has no effect from a DNA mutation.


Mutation Worksheet


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