Chapter 4 of 10
Concept Maps
Principles of Inheritance and Variation — Concept Maps
Tamil Nadu Board · Class 12 · Zoology
3 concept maps of Principles of Inheritance and Variation for Tamil Nadu Board Class 12 Zoology, each also written out as a text outline.
44 questions24 flashcards5 concepts
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3 Concept Maps
Shows how multiple alleles exist in a population but individuals carry only two; demonstrates the relationship between number of alleles and possible genotypes/phenotypes
The map in words
- Gene with Multiple Alleles
- Allele 1: I^A
- Population has 3+ alleles
- Individual inherits 2 alleles
- Possible combinations: 6 genotypes
- Results in 4 phenotypes
- Possible combinations: 6 genotypes
- Individual inherits 2 alleles
- Population has 3+ alleles
- Allele 2: I^B
- Allele 3: I^O
- Allele 1: I^A
Illustrates how three alleles at a single locus produce four distinct blood group phenotypes through different enzyme activities
The map in words
- I^A I^A or I^A I^O
- Enzyme adds NAG: Type A Antigen
- 4 Phenotypes
- Enzyme adds NAG: Type A Antigen
- I^B I^B or I^B I^O
- Enzyme adds Galactose: Type B Antigen
- I^A I^B
- Both enzymes active: Type AB Antigen
- I^O I^O
- No enzyme produced: Type O No Antigen
Shows mapping of six possible genotype combinations to four blood type phenotypes
The map in words
- ABO Blood Group Genotypes
- Genotype: I^A I^A
- Type A Phenotype
- 6 Genotypes → 4 Phenotypes
- Type A Phenotype
- Genotype: I^A I^O
- Genotype: I^B I^B
- Type B Phenotype
- Genotype: I^B I^O
- Genotype: I^A I^B
- Type AB Phenotype
- Genotype: I^O I^O
- Type O Phenotype
- Genotype: I^A I^A
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Explore DiagramsFrequently Asked Questions
What are the important topics in Principles of Inheritance and Variation for Tamil Nadu Board Class 12 Zoology?
Key topics in Principles of Inheritance and Variation include 1 Multiple Alleles, 2 Human Blood Groups - ABO System, 3 Genetic Control of Rh Factor, 3.1 Erythroblastosis Foetalis (Hemolytic Disease of Newborn). Study these first, then practise questions on each for the Tamil Nadu Board Class 12 board exam.
What do the concept maps for Principles of Inheritance and Variation show?
The 3 maps show how the ideas in Principles of Inheritance and Variation connect: Shows how multiple alleles exist in a population but individuals carry only two; demonstrates the relationship between number of alleles and possible genotypes/phenotypes; Illustrates how three alleles at a single locus produce four distinct blood group phenotypes through different enzyme activities. Each map is also written out as an outline on this page.
How should I revise Principles of Inheritance and Variation for the Tamil Nadu Board Class 12 board exam?
Learn the core ideas first, then work through the 44 practice questions on Principles of Inheritance and Variation. Revise definitions regularly and use flashcards for quick recall before the exam.
Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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