1(xii)
The number of autosomes and allosomes present in a human cell:
- (a)22 allosomes, 1 autosome
- (b)22 pairs of autosomes, 1 pair of allosome
- (c)22 autosomes, 1 allosome
- (d)22 pairs of allosomes, 1 pair of autosome
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22 pairs of autosomes, 1 pair of allosome
Reason — Humans have 23 pairs of chromosomes in total. 22 pairs are autosomes (non-sex chromosomes). 1 pair is allosomes (sex chromosomes — X and Y). So, the human cell contains 22 pairs of autosomes and 1 pair of allosomes.