Question

Which represents correct hexaploid nature of Wheat?

	Monosomic	Haploid	Nullisomic	Trisomic
(A)	$21$	$28$	$42$	$43$
(B)	$7$	$28$	$40$	$42$
(C)	$21$	$7$	$42$	$43$
(D)	$41$	$21$	$40$	$43$

• A. A
• B. B
• C. C
• D. D

Answer 1

Answer: (D)

D

Presence of multiples of complete haploid chromosomal sets is called as polyploidy. Wheat, Triticum, has basic chromosome number is n= 7; thus the hexaploid species (Triticum aestivum) have 6n= 42. Monosomy is absence of a single chromosome from a diploid cell (2n-1); Nullisomy is absence of one complete pair of homologous chromosomes (2n-2); haploidy is characterized by presence of one complete set of chromosomes as is found in gametes; trisomy is presence of one chromosome in triplicate (2n+1). Thus, for a hexaploid wheat; monosomy (2n-1) = 41; haploidy (2n/2) = 21; Nullisomy (2n-2) = 40; trisomy (2n+1) = 43

So, the correct answer is 'D'.