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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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 nn 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 2 phenotypic ratio:
Transcribed Image Text: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 nn 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 2 phenotypic ratio:
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