Q. What type of plant is formed when colchicines is used in the process of development of $Raphanobrassica$?
A) Triploid
B) Haploid
C) Autotetraploid
D) Allotetraploid
Explanation
Colchinine ( $C_{22}H_{25}O_{6}N$) is used to induce polyploidy. $Raphanobrassica\$($4n = 36$) was produced by G D Karpechenko (1927) by crossing radish ($Raphanus\ sativus\ 2n = 18$) and cabbage ($Brassica\ oleracea\ 2n = 18$). It is the first allotetraploid.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.