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A tall true breeding garden pea plant is crossed with a dwarf true breeding garden pea plant. When the F1 plants were selfed the resulting genotypes were in the ratio of [2016]
  • a)
    1 : 2 : 1 : : Tall homozygous : Tall heterozygous : Dwarf
  • b)
    1 : 2 : 1 : : Tall heterozygous : Tall homozygous : Dwarf
  • c)
    3 : 1 : : Tall : Dwarf
  • d)
    3 : 1 : : Dwarf : Tall
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
A tall true breeding garden pea plant is crossed with a dwarf true bre...

Phenotypic ratio : 3: 1 (Tall :Dwarf) Genotypic Ratio: 1:2:1 (Homozygous Tall : Heterozygous Tall : Dwarf) 
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A tall true breeding garden pea plant is crossed with a dwarf true bre...
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A tall true breeding garden pea plant is crossed with a dwarf true bre...
Explanation:

The given cross is between a tall true-breeding pea plant (TT) and a dwarf true-breeding pea plant (tt).

Key Points:
- True-breeding refers to plants that, when self-pollinated or cross-pollinated, produce offspring identical to the parent.
- Tall is dominant over dwarf.
- Homozygous means having two identical alleles for a particular trait, while heterozygous means having two different alleles for a particular trait.

Punnett Square:
To determine the genotypes of the F1 generation, we can use a Punnett square.

T t
T TT Tt
t Tt tt

In this case, all the F1 plants are heterozygous (Tt) and tall because the tall allele is dominant over the dwarf allele.

F1 Generation:
When the F1 plants (Tt) are selfed, we need to consider all possible combinations of alleles.

T t
T TT Tt
t Tt tt

The resulting genotypes are:
- Tall homozygous (TT) - 1/4 or 25%
- Tall heterozygous (Tt) - 2/4 or 50%
- Dwarf (tt) - 1/4 or 25%

Ratio of Genotypes:
To determine the ratio of genotypes, we count the number of each genotype and express it as a ratio.

The ratio of genotypes in the F2 generation is 1 : 2 : 1, which means:
- 1 part tall homozygous (TT)
- 2 parts tall heterozygous (Tt)
- 1 part dwarf (tt)

Therefore, the correct answer is option 'A': 1 : 2 : 1 : : Tall homozygous : Tall heterozygous : Dwarf.
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A tall true breeding garden pea plant is crossed with a dwarf true breeding garden pea plant. When the F1 plants were selfed the resulting genotypes were in the ratio of [2016]a)1 : 2 : 1 : : Tall homozygous : Tall heterozygous : Dwarfb)1 : 2 : 1 : : Tall heterozygous : Tall homozygous : Dwarfc)3 : 1 : : Tall : Dwarfd)3 : 1 : : Dwarf : TallCorrect answer is option 'A'. Can you explain this answer?
Question Description
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