Final answer:
In snapdragons, as in pea plants, the combination of alleles that can produce white flowers is one containing two recessive alleles, which in the options provided corresponds to c) yy.
Step-by-step explanation:
When analyzing the combination of alleles that could produce white flowers in snapdragons, according to Mendelian genetics, we know that certain allele combinations correspond with specific phenotypes. In snapdragons, white flowers can be produced by the genotype that involves two recessive alleles.
For example, if we consider the information that in pea plants, purple flowers (P) are dominant to white flowers (p) and yellow peas (Y) are dominant to green peas (y), the analogous situation in snapdragons would be that the presence of two recessive alleles (pp) would result in white flowers. Hence, the correct answer to which combination of alleles could produce white flowers in snapdragons is c) yy, assuming that the Y allele is not relevant to the flower color in snapdragons
It's important to note that a 3x3 Punnett square or a 2x2 Punnett square is commonly used to determine the genotypic and phenotypic ratios in such genetic crosses.