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Question
In the hexaploid wheat, the haploid (n) and basic (x) numbers of chromosomes are
In the hexaploid wheat, the haploid (n) and basic (x) numbers of chromosomes are
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Solution
The correct option is D n = 21 and x=7
The formation of the seven chromosome clusters now explains the occasional occurrence of remnants of multiple associations, which have been reported at later stages of meiosis in hexaploid (and tetraploid) wheat. Hexaploid wheat possesses 42 chromosomes derived from its three ancestral genomes. The 21 pairs of chromosomes can be further divided into seven groups of six chromosomes (one chromosome pair being derived from each of the three ancestral genomes), based on the similarity of their gene order. So, since 2n = 42, n=21 and x = 7 because, 21 pairs of chromosomes can be further divided into seven groups of six chromosomes. Thus, option D is correct and other options are wrong.
The formation of the seven chromosome clusters now explains the occasional occurrence of remnants of multiple associations, which have been reported at later stages of meiosis in hexaploid (and tetraploid) wheat. Hexaploid wheat possesses 42 chromosomes derived from its three ancestral genomes. The 21 pairs of chromosomes can be further divided into seven groups of six chromosomes (one chromosome pair being derived from each of the three ancestral genomes), based on the similarity of their gene order. So, since 2n = 42, n=21 and x = 7 because, 21 pairs of chromosomes can be further divided into seven groups of six chromosomes. Thus, option D is correct and other options are wrong.
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