Question

From diploid chromosome number 14,how many different trisomics could be found?

Answer 1

In this type of trisomic, the extra chromosome is normal and completely homologous to one pair of homologues in the chromosome complement. Each chromosome exerts a separate effect on the phenotype of the plant and therefore, trisomics for different chromosomes can be identified.

ADVERTISEMENTS:

In Daturastramonium, primary trisomics (2n + 1 = 25) for each chromosome were distinguished according to the differences in capsule size and shape; size and length of spines; size of plants; growth habit; size, shape and forms of leaf, flower and stigma. Trisomic for each chromosome in Datura was given a separate name by Blakeslee.

They are named as rolled:

(1) Glossy

(2) Buckling

ADVERTISEMENTS:

(3) Elongate

(4) Echinus

(5) Cocklebur

(6) Microcarpic

(7) Reduced

(8) Poinsettia

(9) Spinach

(10) Globe

(11) Ilex