Chromosomal Mutations

Chromosomal Mutations

Duplication, Inversion, Deletion, and Translocation

Multiple Choice

Review

A ________ is a small section of DNA that codes for a protein.

• chromatid

• gene

• subset

• jean

Multiple Select

Which of these are nitrogenous bases used in DNA?

• A

• U

• T

• C

• G

Multiple Choice

During cell division, the DNA condenses into densely coiled sections called...

• chronographs

• homeostasis

• genes

• chromosomes

Vocabulary Review

A gene is a small section of DNA that codes for a protein.

Chromosomes are long pieces of DNA that have been condensed. They contain many genes.

Mutations are changes in the DNA.

Review: Types of gene mutations

• There are 3 kinds of gene mutations...

• Insertion - Adding bases ( + )

• Deletion - Removing bases ( - )

• Substitution - Changing bases ( = )

• Insertions & deletions are frameshift mutations

Poll

How much do you think you remember from DNA?

• All of it

• Lots of it

• Some of it

• Not much

Chromosomal Mutations

• There are 4 types of chromosomal mutations

• Duplication

• Inversion

• Deletion

• Translocation

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Duplication

Part of the chromosome is "copied & pasted" back into itself.

Inversion

Part of the chromosome is flipped so that the genes are reversed in order.

Deletion

Part of the chromosome is removed and lost.

Translocation

Section of two non-homologous chromosomes are switched.

This is not like crossing over because the pieces are not equivalent!

Crossing Over

Crossing over is not considered to be a mutation.

During crossing over, homologous chromosomes exchange equivalent sections of their genes.

This process naturally occurs in Prophase I.

Multiple Choice

Which of these is not a type of chromosomal mutation?

• Inversion

• Deletion

• Transcription

• Translocation

Multiple Choice

What type of mutation is this?

• Duplication

• Inversion

• Deletion

• Translocation

• none

Multiple Choice

What type of mutation is this?

• Duplication

• Inversion

• Deletion

• Translocation

• none

Multiple Choice

What type of mutation is this?

• Duplication

• Inversion

• Deletion

• Translocation

• none

Multiple Choice

What type of mutation is this?

• Duplication

• Inversion

• Deletion

• Translocation

• none

Multiple Choice

What type of mutation is this?

• Duplication

• Inversion

• Deletion

• Translocation

• none