Question

when a tall plant TTLL long starch grain cross with dwarf small sized grain ttll the F1 generations consist of tall plant and intermediate starch grain what would be the phenotypic ratio of tall plant with large size grain inF2 generation

Answer 1

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Answer 2

Answer:

12:4

Explanation:

Starch grain size is the case of incomplete dominance where, in the heterotypic condition the dominant allele for starch grain (L) fails to show its effect in presence of recessive allele (l).

F1 generation-  TtLl

• by a cross between TtLl  X  TtLl
• the gametes will be-  TL  Tl  tL  tl
• Making a Punnett square for F2 generation-

As we can see in the given Punnett Square

• All the ones which are highlighted with yellow color are phenotypically tall (either TT or Tt) which are 12 in number.
• And the ones which have large starch grain size (LL) are highlighted with blue color, are 4 in number

So, we can conclude that the ratio of -

Phenotypically tall plants: Large strach grains = 12:4