Pedigree analysis is a powerful tool to study the inheritance pattern of a particular trait or disease in a family. Tongue rolling is a simple genetic trait, which is controlled by a single gene with two alleles: R (dominant) and r (recessive). In this article, we will discuss the pedigree analysis of tongue rolling with a full diagrammatic view.

Pedigree Analysis of Tongue Rolling

Pedigree analysis is a diagrammatic representation of the genetic relationships among individuals in a family. The following are the steps involved in the pedigree analysis of tongue rolling:

Step 1: Collect the Information

The first step in pedigree analysis is to collect the information about the trait of interest (tongue rolling) in a family. This information can be obtained through interviews and medical records.

Step 2: Construct the Pedigree Chart

The pedigree chart is a diagrammatic representation of the genetic relationships among individuals in a family. The following symbols are used in the pedigree chart:

- Square symbol represents a male individual
- Circle symbol represents a female individual
- Filled symbol represents an individual who expresses the trait of interest (tongue rolling)
- Unfilled symbol represents an individual who does not express the trait of interest (non-tongue roller)

The following is the pedigree chart of tongue rolling:

![Pedigree Chart of Tongue Rolling](

https://edurev.in/zoom_image/2275121/705x640/pedigree-chart-of-tongue-rolling) https://edurev.in/zoom_image/2275121/705x640/pedigree-chart-of-tongue-rolling)

Step 3: Analyze the Pedigree Chart

The analysis of the pedigree chart involves the following steps:

- Count the number of affected individuals (filled symbols) and unaffected individuals (unfilled symbols) in each generation.
- Determine the mode of inheritance of the trait of interest (tongue rolling).
- Determine the probability of an offspring inheriting the trait of interest.

In the pedigree chart of tongue rolling, we can observe the following:

- The trait of interest (tongue rolling) is present in every generation.
- Both males and females are affected by the trait of interest, indicating an autosomal inheritance pattern.
- The parents of affected individuals are unaffected, indicating a recessive inheritance pattern.
- The probability of an offspring inheriting the trait of interest is 25% if both parents are carriers of the recessive allele.

Conclusion

In conclusion, pedigree analysis is a powerful tool to study the inheritance pattern of a particular trait or disease in a family. The pedigree analysis of tongue rolling reveals an autosomal recessive inheritance pattern, which can be useful in genetic counseling and predicting the probability of an offspring inheriting the trait of interest.