anonymous
  • anonymous
when gregor mendel crossed true-breeding tall plants with true-breeding short plants, why was it impossible to observe segregation?
Biology
schrodinger
  • schrodinger
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thomaster
  • thomaster
because all offspring plants would be the trait that is dominant
anonymous
  • anonymous
Because there was only one trait observed. So he was observing tall ( S ) and short (s) therefore the allele observed would not follow the segregation law which states that every allele segregates independently at meiosis I. So when he did it with 2 alleles ( lets say color in this case ) he got SsYy and they all segregated independently. Therefore giving every possibilities of offspring
thomaster
  • thomaster
lets say tall is dominant and short is recessive. You would cross TT with tt the offspring would be only Tt which means that all plants will be tall.

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anonymous
  • anonymous
ok a
anonymous
  • anonymous
A) alleles for height do not segregate in the F2 B) alleles segregate only in the F2 generation C ) alleles segregate best when two tall plants are crossed D) alleles in the F1 must be Tt to have height variety in the F2
anonymous
  • anonymous
As thomaster explained it (I used a different definition I believe) the answer would be b
anonymous
  • anonymous
I could be wrong ^^ if so I apologize haha
thomaster
  • thomaster
B and D are correct i think
anonymous
  • anonymous
d
thomaster
  • thomaster
with TT x tt every offspring will be Tt so B is true but if the alleles in F1 are Tt you would have height variety in F2 So they're both correct
thomaster
  • thomaster
But i'd take D as answer
anonymous
  • anonymous
ok thanks
JTfan2000
  • JTfan2000
Agreed with B

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