Q= HOW does colchicine induce polyploidy?? briefly describe the steps involved in the development of triticale??

Dear student,
Please find below the solution to the asked query
 
Colchicine is a chemical that binds to the tubulin, one of the main constituents of microtubules and inhibits microtubule polymerization. Availability of tubulin is essential to mitosis for the formation of spindle fibres, and therefore colchicine effectively affects the function of the spindle fibres. Thus, it affects separation of chromosomes during cell division and results in the doubling of chromosomes i.e polyploidy of cells.
 

Triticale is man -made hybrid of durum wheat and rye (Secale cereale). It is amphidiploid, containing genomes from two different species.

It is produced by crossing  durum wheat (female parent) and rye (male parent). Durum wheat has diploid (2n) chromosome number of 28 while rye has a diploid (2n)  chromosome number of 14.  Hybridization of haploid durum wheat (n ) with 14 chromosomes and haploid (n) rye with 7 chromosomes would result in sterile hybrid of 21 chromosomes. To make this hybrid fertile, colchicine is used that double the chromosome number and produce triticale with  42 chromosomes.

 
Hope this information will clear your doubts about the colchicine and triticale.
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