By nightshade, the allele that produces purple petals is dominant over that of white petals, and the allele?

producing Barbary capsules is dominant over that for capsules smooth. A plant with white petals and capsules Muscovy is crossed with one that had petals Vilet and soft capsules. The F1 generation consisted of 47 plants with white petals and smooth capsules, 50plants with purple petals and burrs, 46 plants with purple petals and capsule smooth. What were the genotypes of the parents?

These types of questions are quite simple actually. If you look carefully, you have descendants who are the double recessive (white petals + capsules smooth). To help you get the double recessive offspring, both parents can not have a homozygous dominant allele combination, ie. or purple or Barbarism homozygous homozygous. Therefore, the genotypes of parents must be white (homozygous) Barbary (heterozygous) and purple (heterozygous) smooth (homozygous). (If you do not get not work detailed below) -------------------------- --------------- ----------------------------------- ------- Suppose that V is the allele petals violet V is the allele of white petals, P is the allele for burrs, and p is the allele of the capsule gently. Writing genotypes propablement parents: white petals + = vvPP burrs or purple petals vvPp + capsules smooth = VVpp or Vvpp wrote on genotypes propablement generation F1: petals white + capsules smooth purple petals vvpp = + = VVPP or burrs or VvPP VVPp or purple petals VvPp + caps or smooth = VVpp Vvpp If you made tickets for the tray different parent combinations of genotypes, you would realize that for there to be descendants vvpp, parents may not have any combination homozygous dominant allele in their genotype, ie vvPP VVpp and combinations. Then the genotypes of the parents can be vvPp and Vvpp.


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