Type of chromosomal abberation in which exchange of chromosomal segment takes place between non homologous chromosome is called
Answers
Two situations are:
(i) When the genes of different traits are located on the same chromosome and must be distantly located to enhance the recombination frequency.
(ii) When the genes of different traits may be located on different chromosomes.
Explanation:
Answer:
Chromosomal aberrations:
(1) The structural, morphological change, which take place in chromosome due to rearrangement, is called chromosomal aberrations.
(2) The aberrations change the sequence of the genes. This causes variations. Chromosomal aberrations are mainly of following four types
(i) Deletion: Loss of genes from chromosome.
(ii) Duplication: Genes are repeated or doubled in number on chromosorne.
(iii) Inversion : A paricular segment or chromosome is broken and gets reattached to the same chromosome in an inverted position due to 180 twist. There is no loss or gain of gene complement of the chromosome.
(iv) Translocation: Transfer or transpostion of a part of chromosome or a set of genes to a non-homologous chromosome is called translocation. It is effected naturally by he transposons present in the cell.