Question
Biology Question on Strategies For Enhancement in Food Production
In which one of the following options, the number of chromosomes in the present day hexaploid wheat are correctly represented ?
A
Monosomic - 21, Haploid - 28, Nullisomic - 42, Trisomic - 43
B
Monosomic - 7, Haploid - 28, Nullisomic - 40, Trisomic - 42
C
Monosomic - 21, Haploid - 7, Nullisomic - 42, Trisomic - 43
D
Monosomic - 41, Haploid - 21, Nullisomic - 40, Trisomic - 43
Answer
Monosomic - 41, Haploid - 21, Nullisomic - 40, Trisomic - 43
Explanation
Solution
The common wheat is hexaploid with 2n = 42. It is an allopolypoid derived from three diploid species each with 2n = 14. As for it 2n = 42, thus its haploid set will have 21 chromosomes, monosomic (2n - 1) will have 41 chromosomes, nullisomic (2n - 2) will have 40 chromosomes, and trisomic (2n + 1) will have 43 chromosomes.