CHROMOSOMAL MUTATIONS

Easy as Pie Paradise Mashed Potatoes

CHROMOSOMAL MUTATIONS

Mutation: A sudden change in the structure or the amount of genetic material.•Mutations, Crossing Over, and Independent Assortment increase genetic variation in a population.

Target: I will be able to identify the main types of chromosomal mutations.

Pg. 39

Chromosomal Mutation: An abnormal change in the structure of all or part of a chromosome or the number of chromosomes.

Types of Chromosomal Mutations: 1. Deletion: When a piece of chromosome is missing.

2. Duplication/Addition: When a piece of chromosome is added to the homologous chromosome.

3. Translocation: When a piece of chromosome is added to the nonhomologous chromosome.

4. Inversion: When the order of genes is switched in a chromosome.  

5. Nondisjunction: When disjunction doesn’t occur correctly during anaphase of meiosis, so the gamete has an extra or missing chromosome.

R r

rR

R r

R r R r

rR

4. Inversion: When the order of genes is switched in a chromosome.  

5. Nondisjunction: When disjunction doesn’t occur correctly during anaphase of meiosis, so the gamete has an extra or missing chromosome. Chromosomal Mutations

Summary:

IDENTIFYING MUTATIONS ACTIVITY

Father: Mother:

Pg. 38

A

B

C

D

E

a

b

c

d

e

T

W

X

Y

Z

t

w

x

y

z

A

B

C

D

E

a

b

c

d

e

T

W

X

Y

Z

t

w

x

y

z

A

B

C

d

e

T

W

X

Y

A

B

C

D

E

E

T

t

w

x

y

z

t

w

x

y

z

• Crossing Over of d&e genes on Dad

• Deletion of Z gene on Dad

• Inversion of W&X genes on Dad

• Duplication (Addition) of E gene on Mom

• Translocation of T gene on Mom

• Nondisjunction of t-z chromosome on Mom

PROBLEM 1