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1.Sexual Reproduction in Flowering Plants
normal
In which one of the following combinations $(a - d)$ the number of chromosomes of the present day hexaploid wheat is correctly represented?
A
Mono-somic $\to $ $21$, Haploid $\to $ $28$, Nulli-somic $\to $ $42$, Tri-somic $43$
B
Mono-somic $\to $ $7$, Haploid $\to $ $28$, Nulli-somic $\to $ $40$, Tri-somic $42$
C
Mono-somic $\to $ $21$, Haploid $\to $ $7$, Nulli-somic $\to $ $42$, Tri-somic $43$
D
Mono-somic $\to $ $41$, Haploid $\to $ $21$, Nulli-somic $\to $ $40$, Tri-somic $43$
(AIIMS-2006)
Solution
$1n = 21$; monosomic $(2n -1) = 42 -1 = 41$; nullisomic $(2n -2) = 42 -2 = 40.$ Trisomic $(2n + 1) = 42 +1 = 43$
Std 12
Biology
