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Mendel's Law of Dominance MCQ - Practice Questions with Answers

Edited By admin | Updated on Sep 18, 2023 18:34 AM | #NEET

Quick Facts

  • Interpretation of Monohybrid Cross: Law of Dominance is considered one of the most asked concept.

  • 14 Questions around this concept.

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Which one of the following cannot be explained on the basis of Mendel's Law of Dominance?

Concepts Covered - 1

Interpretation of Monohybrid Cross: Law of Dominance
  • Based on his observations on monohybrid crosses Mendel proposed two general rules to consolidate his understanding of inheritance in monohybrid crosses. 
  • Today these rules are called the Principles or Laws of Inheritance: the First Law or Law of Dominance and the Second Law or Law of Segregation.
  • Since, monohybrid crosses focussed on one pair of contrasting characters, which is controlled by one gene or a pair of alleles, hence the inheritance of both the alleles was studied.

Law of Dominance:

  • Characters are controlled by discrete units called factors, now called alleles.
  • Factors or alleles occur in pairs.
  • In a dissimilar pair of factors one member of the pair dominates the other.
  • The allele which expresses itself in the hybrid or heterozygous condition is called the dominant allele and the other allele which is unable to express in the heterozygous condition is called recessive allele.

Significance of Law of Dominance:

  • It explains the expression of trait of only one of the parents in F1 generation. 
  • It explains the phenotypic ratio of 3:1 in F2 progeny.
  • It indicates the superiority of mixed population as it hides many of the defective recessive alleles.
     

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Interpretation of Monohybrid Cross: Law of Dominance

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Interpretation of Monohybrid Cross: Law of Dominance

Biology Textbook for Class XII

Page No. : 75

Line : 5

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