Question

What is pedigree analysis? Mention its importance in human genetics.

Hint:

Standard symbols: Square = Male, Circle = Female, Solid/Filled = Affected individual.

Answer 1

Step 1: Understanding the Concept:
Since controlled crosses are not possible in humans, geneticists use family histories to trace traits. This is represented as a family tree called a pedigree.
Step 2: Detailed Explanation:
Pedigree Analysis: It is a record of inheritance of certain genetic traits for two or more generations presented in the form of a diagram or family tree.
Importance:
1. It helps to trace the inheritance of specific traits, abnormalities, or diseases within a family.
2. It is used by genetic counselors to predict the probability of a couple having a child with a specific genetic disorder (like Hemophilia or Sickle Cell Anemia).
3. It helps to determine whether a trait is dominant or recessive, and whether it is autosomal or sex-linked.
Step 3: Final Answer:
Pedigree analysis is a genealogical study of traits used to predict and analyze the transmission of genetic disorders in human families.