Biology Forum Genetics Genetic problem – desperately need help

last updated by Cat 16 years ago
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    • #9299
      georgina009
      Participant

      Can anyone help me with this question? I am very confused!
      In corn-
      coloured kernal – R
      colurless – r
      green plant colour – Y
      yellow plant colour – y

      The R and Y genes are linked. Two different plants (1 and 2) that were heterozygous for each trait – RrYy – were test crossed to plants that were homozygous for reccessive alleles. this info was gotton from that:
      Coloured green -plant 1 145 plant 2- 18
      colured yellow – 1-13 2-175
      colourless green – 1 – 17 2- 185
      colourless yellow – 1- 125 2- 22

      what phenotypic ratio is expected in each if the genes were unlinked
      and
      plant 1 and 2 were generated by crossing true breeding plants. Crossing RRYYx rryy plants generated plant 1. The parents of plant 2 had genotypes that were different from the genotypes of the parents of plant 1. What are the genotypes of parents from plant 1?

      Very confusing question. Any help is much appreciated.

    • #82885
      Cat
      Participant

      I provided an answer for your question on my web. Please, visit
      http://science-ed.fullsubject.com/1-on- … t12.htm#22

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