Which is the longest chromosome?: (A) Chromosome 1, (B) Chromosome 21, (C) Chromosome 14, (D) Chromosome X
Answer is A. Chromosome 1 is the longest chromosome. In a karyotype, chromosomes- arranged according to their length and banding features. Chromosomes 1 to 22 are arranged according to their length, in the descending order. Chromosome X is longer than the Y Chromosome.