Question

Sol.(c) [Key Concept: Linkage — No Variation Among Siblings] LINKAGE will NOT result in variations among siblings because linked genes are inherited together (as parental combinations), maintaining the same gene associations across generations. Linked genes reduce recombinant types and maintain parental combinations. In contrast: (a) independent assortment randomly distributes chromosomes to gametes producing new combinations; (b) crossing over exchanges segments between homologous chromosomes creating recombinants; (d) mutation creates new alleles — all increasing variation.