Question

In an exprement phenotypic ratio of 3:3:1:1 was obtained in the offspring on crossing yellow seeded tall stem (Yytt) variety.Describe the accuracy of this data by punnet square?

Answer 1

The punnett square can be represented as :
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The cross between Yellow seeded tall stem (YyTt) and Yellow seeded dwarf stem (Yytt) varieties of garden pea plants can be represented as:

Parents           YyTt           x              Yytt

​Gametes          YT, Yt, yT, yt           Yt, yt


​From the above punnett square, it is clear that plants with genotype ​YyTt ( phenotype-Yellow tall seeded plants when crossed with plants having genotype Yytt (phenotype - Yellow dwarf seeded plants, the phenotypic ratio obtained is 3:3:1:1.

It can be represented as 
Yellow tall (3) : Yellow dwarf (3) : Green tall (1) : Green dwarf (1).


Hope this helps !!

Answer 2

It is possible to visualise the punnett square as:

Garden pea plants that have undergone a cross between yellow seeded tall stem (YyTt) and yellow seeded dwarf stem (Yytt) kinds can be described as:

Parents           YyTt           x              Yytt

​Gametes          YT, Yt, yT, yt           Yt, yt

The phenotypic ratio produced by crossing plants with genotypes YyTt (phenotype - Yellow tall seeded plants and Yytt (phenotype - Yellow dwarf seeded plants) is 3:3:1:1. This is evident from the punnett square shown above.

It can be represented as

Yellow tall (3) : Yellow dwarf (3) : Green tall (1) : Green dwarf (1).

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