Epistasis Bulb color in onions is determined by two genes that show epistasis. Pigment is only produced when the N allele is present. Individuals of the n genotype have no color (white). If color is present, it may be determined by the P or p alleles at the second gene. PP or Pp results in purple color, while pp results in yellow bulbs. 1 What F, and F2 genotypic & phenotypic ratios are observed from a cross between PPNN and ppnn onions? a F genotype: ;F, phenotype: b F2: C F2 phenotypic ratio:

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Inheritance and Mendelian Genetics

Inheritance means the passing of traits to offspring from parents. These traits could be passed either through asexual reproduction or sexual reproduction. The offspring receives the genetic material from the parents. Mendelian inheritance is a certain biological inheritance that follows the rules and principles laid down by Gregor Mendel in 1865. The initial hypothesis was considered wrong, but other inheritance theories modified the concept of inheritance and thus genetics.