Info

Source: After F. C. Elliot, Plant Breeding and Cytogenetics (New York: McGraw-Hill, 1958), p.

Source: After F. C. Elliot, Plant Breeding and Cytogenetics (New York: McGraw-Hill, 1958), p.

Table 9.3 Different types of chromosome mutations

Chromosome Mutation

Definition

Chromosome rearrangement

Change in chromosome structure

Chromosome duplication

Duplication of a chromosome segment

Chromosome

Deletion of a chromosome segment

Inversion

Chromosome segment inverted 180 degrees

Paracentric inversion

Inversion that does not include the centromere in the inverted region

Pericentric inversion

Inversion that includes the centromere in the inverted region

Translocation

Movement of a chromosome segment to a nonhomologous chromosome or region of the same chromosome

Nonreciprocal translocation

Movement of a chromosome segment to a nonhomologous chromosome or region of the same chromosome without reciprocal exchange

Reciprocal translocation

Exchange between segments of nonhomologous chromosomes or regions of the same chromosome

Aneuploidy

Change in number of individual chromosomes

Nullisomy

Loss of both members of a homologous pair

Monosomy

Loss of one member of a homologous pair

Trisomy

Gain of one chromosome, resulting in three homologous chromosomes

Tetrasomy

Gain of two homologous chromosomes, resulting in four homologous chromosomes

Polyploidy

Addition of entire chromosome sets

Autopolyploidy

Polyploidy in which extra chromosome sets are derived from the same species

Allopolyploidy

Polyploidy in which extra chromosome sets are derived from two or more species

0 0

Post a comment