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The dwarfness in plants of F(2) fenerati...

The dwarfness in plants of `F_(2)` feneration is

A

Recessive

B

Dominant

C

Co-dominant

D

In-complete dominance

Text Solution

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The correct Answer is:
To solve the question regarding dwarfness in plants of the F2 generation, we can follow these steps: ### Step-by-Step Solution: 1. **Understanding the Genetic Terms**: - In genetics, traits can be either dominant or recessive. Dominant traits are expressed when at least one dominant allele is present, while recessive traits are only expressed when two recessive alleles are present. 2. **Identifying the Alleles**: - In this case, we denote the tall trait with a capital letter (T) and the dwarf trait with a lowercase letter (t). Therefore, T represents the dominant allele (tall), and t represents the recessive allele (dwarf). 3. **Crossing the Parents**: - When we perform a cross between a homozygous tall plant (TT) and a homozygous dwarf plant (tt), all offspring (F1 generation) will be heterozygous (Tt) and exhibit the tall phenotype because the tall trait is dominant. 4. **F2 Generation Formation**: - When we self-cross the F1 generation (Tt x Tt), we can use a Punnett square to determine the genotypes of the F2 generation. The possible combinations are: - TT (tall) - Tt (tall) - Tt (tall) - tt (dwarf) 5. **Analyzing the F2 Generation**: - From the Punnett square, we see that the genotypic ratio is 1 TT : 2 Tt : 1 tt. This means that 3 out of 4 plants will be tall (either TT or Tt), while 1 out of 4 will be dwarf (tt). 6. **Conclusion**: - Dwarfness in the F2 generation is due to the presence of the recessive allele (tt). Therefore, dwarfness is expressed only when both alleles are recessive. ### Final Answer: Dwarfness in plants of the F2 generation is due to the recessive allele (tt). ---
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