Question:
In a garden pea plant, the flowers are in axial (A) position. Find out the proportion of flowers in terminal position (a), if a cross is made between two heterozygous plants.
In a garden pea plant, the flowers are in axial (A) position. Find out the proportion of flowers in terminal position (a), if a cross is made between two heterozygous plants.
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A heterozygous monohybrid cross always yields a 3:1 phenotypic ratio and 1:2:1 genotypic ratio.
Updated On: Mar 9, 2026
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Solution and Explanation
Step 1: Understanding the Concept:
Axial (A) is dominant over terminal (a). Heterozygous plants have the genotype Aa.
Step 2: Detailed Explanation:
Cross: Aa \(\times\) Aa
Punnett Square:
- AA (Axial)
- Aa (Axial)
- Aa (Axial)
- aa (Terminal)
The ratio is 3:1. The terminal position (aa) appears in 1 out of 4 cases.
Step 3: Final Answer:
The proportion is 1/4 or 25%.
Axial (A) is dominant over terminal (a). Heterozygous plants have the genotype Aa.
Step 2: Detailed Explanation:
Cross: Aa \(\times\) Aa
Punnett Square:
- AA (Axial)
- Aa (Axial)
- Aa (Axial)
- aa (Terminal)
The ratio is 3:1. The terminal position (aa) appears in 1 out of 4 cases.
Step 3: Final Answer:
The proportion is 1/4 or 25%.
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