The study of inheritance of a particular trait in humans by collecting information from family history and representing it through a family tree using standard symbols is called pedigree analysis.
Topics
Reproduction in Organisms
Sexual Reproduction in Flowering Plants
- Flower
- Pre-fertilisation in Flowering Plant: Structures and Events
- Structure and Development of Anther
- Microsporogenesis
- Structure and Development of Male Gametophyte
- Pollen Products
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- Megasporogenesis
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- Pollination
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- Endosperm
- Embryo
- The Seed
- Apomixis
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Reproduction
Human Reproduction
- Human Reproduction
- The Male Reproductive System
- The Female Reproductive System
- Gametogenesis
- Structure of Sperm
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Genetics and Evolution
Reproductive Health
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- Sexually Transmitted Diseases (STD) or Sexually Transmitted Infections (STI)
- Infertility
- Assisted Reproductive Technology (ART)
- Amniocentesis
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Biology and Human Welfare
Principles of Inheritance and Variation
- Heredity and Variation
- Gregor Johann Mendel – Father of Genetics
- Mendel's Experiments on Inheritance
- Monohybrid Cross
- Punnett Square
- Back Cross and Test Cross
- Mendel's Laws > The Law of Dominance
- Mendel's Laws > The Law of Segregation (Law of Purity of Gametes)
- Exceptions to Mendel's Principles > Incomplete Dominance
- Exceptions to Mendel's Principles > Co-Dominance
- Dihybrid Cross
- Mendel's Laws > The Law of Independent Assortment
- Chromosomal Theory of Inheritance
- Linkage and Recombination
- Polygenic Inheritance
- Exceptions to Mendel's Principles > Pleiotropy
- Sex Determination
- Sex Determination in Humans
- Sex Determination in Honey Bees
- Mutations
- Pedigree Analysis
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- Chromosomal Disorders or Abnormalities
Biotechnology
Environmental Issues
- Controlling Vehicular Air Pollution: a Case Study of Delhi
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Ecology
Molecular Basis of Inheritance
- Deoxyribonucleic Acid (DNA)
- Structure of Polynucleotide Chain
- Packaging of DNA Helix
- Search for Genetic Material
- Griffith’s Experiment
- Avery, McCarty and MacLeod’s Experiment
- The Hershey-Chase Experiment
- Properties of Genetic Material
- The RNA World
- DNA Replication
- Conservative Replication
- Dispersive Replication
- Semi-Conservative Replication
- Meselson and Stahl’s Experiment
- Enzymes used in DNA Replication
- Mechanism of DNA Replication
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- Process of Transcription in Eukaryotes
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Evolution
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- Overview of Evolution
Human Health and Diseases
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- Diseases Caused by Helminths > Ascariasis
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Strategies for Enhancement in Food Production
Microbes in Human Welfare
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- Microbes in Sewage Treatment
- Microbes in Production of Biogas
- Microbes as Biocontrol Agents
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- Applications of Biotechnology in Health and Medicine
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Biotechnology - Principles and Processes
Biotechnology and Its Application
- Concept of Biotechnology
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Organisms and Populations
- Organisms and Their Environment
- Ecology
- Population Attributes
- Population Growth
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- Negative Interactions > Predation
- Negative Interactions > Competition
- Negative Interactions > Parasitism
- Positive Interactions > Commensalism
- Positive Interactions > Mutualism (Symbiosis)
- Overview of Organisms and Populations
Ecosystem
Biodiversity and Its Conservation
Estimated time: 4 minutes
CBSE: Class 12
CISCE: Class 12
CISCE: Class 12
Definition: Pedigree analysis
CBSE: Class 12
Key Points: Pedigree Analysis
- Pedigree Analysis is the study of inheritance patterns of traits across several generations of a family; the chart representing this is called a family tree (pedigree).
- Since controlled crosses (like in pea plants) cannot be done in humans, family history analysis is used as an alternative to study inheritance.
- Pedigree analysis is a powerful tool in human genetics used to trace the inheritance of a specific trait, abnormality or disease.
- Standard symbols used - Square = normal male, Circle = normal female, Diamond = sex unspecified; filled/shaded shapes = affected individuals.
- A horizontal line between two symbols = mating; a double horizontal line = consanguineous mating (mating between relatives); children are shown below parents in order of birth from left to right.
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Related QuestionsVIEW ALL [5]
Study the Pedigree chart given below and answer the questions that follow:
Symbols used in the given Pedigree Chart are as follows:
 |
Carrier male |
 |
Affected male |
 |
Normal male |
 |
Carrier female |
 |
Affected female |
 |
Normal female |
(a) On the basis of the inheritance pattern exhibited in this pedigree chart, what conclusion can you draw about the pattern of inheritance?
(b) If the female is homozygous for the affected trait in this pedigree chart, then what percentage of her sons will be affected?
(c) Give the genotype of offspring 1, 2, 3 and 4 in III generations.
OR
(c) In this type of inheritance pattern, out of male and female children which one has less probability of receiving the trait from the parents? Give a reason.
