Final answer:
The number of genes controlling flower size in sunflowers is complex and often involves multiple genes. This question would usually require genetic crosses or molecular analysis to answer accurately, as it extends beyond Mendel's initial single-gene hypothesis.
Step-by-step explanation:
The question of how many genes control flower size in a particular strain of sunflowers is a typical question in Biology, specifically in the field of genetics. Mendel's studies initially suggested that traits are controlled by single genes; however, we now understand that this is an oversimplification. Most traits, including flower size and color, are often controlled by multiple genes, which may have multiple alleles and work in conjunction. The specific number of genes controlling flower size in sunflowers isn't provided here and would typically require empirical research such as genetic crosses or molecular analysis to determine.
For example, the Flowering Locus C (FLC) gene is mentioned to play a role in the flowering of certain plants and is subjected to epigenetic modifications, which demonstrates the complex regulatory mechanisms at the genetic level.
In the context of an experiment involving plant phenotypes, a Mendelian monohybrid cross demonstrates that a single characteristic (e.g., flower color) may not strictly follow Mendel's laws when multiple genes are involved. As such, the observation of the F1 and F2 generations, including the ratios of tall/inflated or dwarf/constricted sunflowers, would need to be analyzed to infer genetic structure and the potential influence of multiple genes.