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When Gregor Mendel crossed true-breeding tall plants with true-breeding short plants, why was it impossible to observe segregation?
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.

Respuesta :

WorldlyGlass49
When Gregor Mendel crossed true-breeding tall plants with true-breeding short plants, it was impossible to observe segregation because D) alleles in the F1 must be Tt to have height variety in the F2.

Answer:

Alleles in the F1 must be Tt to have height variety in the F2.

Explanation:

  • The law of segregation given by Mendel states that the pair of an allele for a given gene separate during the formation of gametes and then these gametes fuse randomly with each other during fertilization to determine the genotype of the individual.
  • Therefore, for a pure breeding tall plant, the alleles would form two gametes each having the allele T and for a pure breeding small plant, each of the gametes will have allele t.
  • Therefore, the only possible combination from TT X tt would be Tt and thus, segregation is not observed.