Question:
Monohybrid crosses are useful in demonstrating which of the following laws of inheritance suggested by Mendel?
Monohybrid crosses are useful in demonstrating which of the following laws of inheritance suggested by Mendel?
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Shortcut:
Monohybrid $\rightarrow$ Dominance + Segregation
Dihybrid $\rightarrow$ Independent assortment
Dihybrid $\rightarrow$ Independent assortment
Updated On: May 8, 2026
- Law of dominance and law of independent assortment.
- Law of segregation and law of independent assortment.
- Law of purity of gamete and law of dominance.
- Law of independent assortment only.
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The Correct Option is C
Solution and Explanation
Concept: A monohybrid cross involves the inheritance of a single trait. Mendel used such crosses to derive fundamental laws of inheritance.
• Law of dominance: One allele expresses itself (dominant), masking the other (recessive).
• Law of segregation (law of purity of gametes): Alleles separate during gamete formation so that each gamete carries only one allele.
Step 1: Understand monohybrid cross.
It studies inheritance of one character (e.g., height of pea plant).
Step 2: Identify laws demonstrated.
• Dominance is observed in F$_1$ generation
• Segregation is observed in F$_2$ generation
Step 3: Check involvement of independent assortment.
Law of independent assortment applies to dihybrid crosses, not monohybrid crosses.
Step 4: Analyze options.
• (A) Includes independent assortment $\rightarrow$ Incorrect
• (B) Includes independent assortment $\rightarrow$ Incorrect
• (C) Dominance + purity of gametes $\rightarrow$ Correct
• (D) Only independent assortment $\rightarrow$ Incorrect
Step 5: Conclusion.
Thus, monohybrid crosses demonstrate dominance and segregation (purity of gametes). Final Answer: Option (C)
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