Lecture Topics/Genetics Home Page

I. Variation in chromosomal structure

A. Single breaks in chromatid

1. Restitution

2. Deletion

B. Single breaks in chromosome

1. Restitution

2. Deletion of acentric fragment

3. Dicentric chromosome forms

C. Double breaks on chromosome

1. Deletion of acentric fragment

2. Inversion of acentric fragment

a. Position effect

b. Crossover suppression (paracentric and pericentric inversion)

D. Double breaks on non-homologous chromosomes

1. Reciprocal translocation (partial sterility)

II. Variation in chromosome number

A. Aneuploidy

1. How does it occur?

2. Examples?

B. Euploidy

1. Euploidy is rare in animals

2. Euploidy in plants is less rare

a. Autopolyploidy

b. Allopolyploidy

III. Problems from chapter 8 that may be useful: 3, 10, 11, 22, 23, 25, 26, 27, 28