Mendelian Genetics
A monohybrid cross between two heterozygotes yields what phenotypic ratio (complete dominance)?
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About This Question
- Subject
- biology
- Chapter
- genetics and evolution
- Topic
- mendelian genetics
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
3:1
- Definition: A monohybrid cross studies the inheritance of a single pair of contrasting characters.
- The Cross: Parents are Aa×Aa.
- Genotypic Result: Using a Punnett square, we get:
- 1 AA (Homozygous dominant)
- 2 Aa (Heterozygous)
- 1 aa (Homozygous recessive)
- Genotypic Ratio = 1:2:1.
- Phenotypic Result: Under complete dominance, both AA and Aa express the dominant trait, while only aa expresses the recessive trait.
- Dominant phenotype : Recessive phenotype = (1+2):1=3:1.
This easy difficulty biology question is from the chapter genetics and evolution, covering the topic of mendelian genetics. It appeared in the 2025 exam.
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