Discussion
The arrangement of genes on the chromosome is
Answer: C
Genes are arranged on a chromosome in a linear order.
Each gene occupies a fixed position (locus) along the length of the chromosome, one after another, like beads on a string. This linear arrangement, shown by T.H. Morgan and A.H. Sturtevant from crossing-over frequencies, is what makes genetic linkage maps possible.
'Antiparallel' describes the two strands of the DNA double helix, not the arrangement of genes, and 'parallel' and 'perpendicular' do not describe it either.
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