Final answer:
Sequence complexity in eukaryotic genomes is the relative amounts of repeated and unique DNA sequences in an organism's genome, a factor that contributes to the genome's overall complexity.
Step-by-step explanation:
In respect to eukaryotic genomes, sequence complexity refers to the relative amounts of repeated and unique DNA sequences present in an organism's genome. This concept was defined by Britten and Davidson who described sequence complexity as a measure of genomic complexity. Eukaryotic genomes, such as the human genome with its 3 billion base pairs per haploid set of chromosomes, display high sequence complexity, which is demonstrated through the presence of multiple origins of replication, and a mix of both coding and non-coding DNA. The sequence complexity can be analyzed by the renaturation rates of DNA, where eukaryotic DNA shows slower re-annealing curves when plotted against the concentration of the renatured DNA multiplied by the time taken to renature (CoT value), in comparison to prokaryotic genomes.