Final answer:
Triticum aestivum is a(n) Bread wheat, because it has complete sets of chromosomes from three ancestral species.
Step-by-step explanation
Triticum aestivum, more commonly known as bread wheat, is a hexaploid. This means that it contains complete sets of chromosomes from three ancestral species, making it a complex hybrid with a significant genetic background.
Polyploidy originates from hybridization events where offspring inherit more than two sets of chromosomes, which is common in plant species and is significant in the relationships of crops such as wheat. In the case of bread wheat,
Hybridization occurred between emmer wheat and a species of Aegilops, resulting in a plant with three distinct genomes. Each genome contributes seven chromosomes; thus, the diploid cells of bread wheat have 42 chromosomes.