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Mendelian Genetics and Heredity

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Q. In a test cross, what is the purpose of crossing an individual with a homozygous recessive?
  • A. To determine the dominant allele
  • B. To identify the genotype of the individual
  • C. To produce offspring
  • D. To analyze gene expression
Q. What is the basic unit of heredity in Mendelian genetics?
  • A. Chromosome
  • B. Gene
  • C. DNA
  • D. RNA
Q. What is the expected genotypic ratio from a dihybrid cross?
  • A. 1:2:1
  • B. 3:1
  • C. 9:3:3:1
  • D. 1:1:1:1
Q. What is the purpose of a Punnett square?
  • A. To determine the DNA sequence
  • B. To predict the genotype ratios of offspring
  • C. To analyze protein structure
  • D. To measure gene expression
Q. What is the role of messenger RNA (mRNA) in gene expression?
  • A. To replicate DNA
  • B. To carry genetic information from DNA to ribosomes
  • C. To form the structure of ribosomes
  • D. To transport amino acids
Q. What is the term for different forms of a gene?
  • A. Chromosomes
  • B. Alleles
  • C. Genotypes
  • D. Phenotypes
Q. What term describes an organism's genetic makeup?
  • A. Phenotype
  • B. Genotype
  • C. Allele
  • D. Locus
Q. Which of the following is an example of a mutation?
  • A. Color blindness
  • B. Height variation
  • C. Blood type
  • D. All of the above
Q. Which of the following represents a homozygous genotype?
  • A. Aa
  • B. AA
  • C. aA
  • D. aA
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Mendelian Genetics and Heredity explains the fundamental principles governing the inheritance of traits from one generation to the next, based on the experiments of Gregor Mendel. This category focuses on the laws of inheritance, genetic crosses, and inheritance patterns, making it suitable for Class 11–12 students, NEET aspirants, and undergraduate learners.

In this section, you will study:

  • Mendel’s experiments and contributions to genetics

  • Laws of inheritance: dominance, segregation, and independent assortment

  • Monohybrid and dihybrid crosses

  • Genotype and phenotype ratios

  • Test cross and back cross

  • Exceptions to Mendelian inheritance (introductory level)

  • Application of Mendelian principles in heredity

  • NCERT-based explanations, diagrams, MCQs, and exam-oriented questions

The content is structured to build strong conceptual foundations, improve cross-based problem solving, and help students perform confidently in school examinations, NEET, and undergraduate assessments.

Develop a clear understanding of Mendelian genetics to master the core principles of heredity and genetic inheritance.

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