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Gene B controls the large size of starch...

Gene B controls the large size of starch grains, while another form 'b forms small grain size. Which of the given character will be expressed by genotypic combination Bb in Pisum ?

A

Wrinkled seed

B

Round seed

C

Intermediate sized starch grains

D

Both (2) & (3)

Text Solution

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The correct Answer is:
To solve the question regarding the expression of the genotypic combination Bb in Pisum (garden peas), we can follow these steps: ### Step-by-Step Solution: 1. **Identify the Alleles**: - The gene B controls the large size of starch grains (dominant allele). - The gene b controls the small size of starch grains (recessive allele). 2. **Understand Dominance**: - According to Mendel's law of dominance, the dominant allele (B) will express its trait over the recessive allele (b) when present in a heterozygous condition (Bb). 3. **Determine the Genotype**: - The genotype Bb consists of one dominant allele (B) and one recessive allele (b). 4. **Analyze the Trait Expression**: - In the case of starch grain size, since B is dominant, we would expect the phenotype associated with the dominant allele (large size) to be expressed in a homozygous dominant (BB) or heterozygous (Bb) condition. 5. **Consider Incomplete Dominance**: - However, the question suggests that there may be incomplete dominance involved. In incomplete dominance, neither allele is completely dominant, leading to an intermediate phenotype. - In this case, if incomplete dominance is at play, the Bb genotype would result in an intermediate size of starch grains, which is neither large nor small. 6. **Conclusion**: - Therefore, for the genotype Bb, the expressed character will be an intermediate size of starch grains due to the incomplete dominance. ### Final Answer: The character expressed by the genotypic combination Bb in Pisum will be an intermediate size of starch grains. ---
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