Question

In a practical examination, the following pedigree chart was given as a spotter for identification. The students identify the given pedigree chart as

• A. Sex-linked dominant
• B. Sex-linked recessive
• C. Autosomal dominant
• D. Autosomal recessive

Hint:

In autosomal recessive inheritance, the trait often skips generations, and both males and females can be equally affected.

Answer 1

The Correct Option is D

• Pedigree Chart Analysis: In this chart, affected individuals appear in both genders and tend to skip generations. These features suggest the inheritance of a recessive trait that can appear in individuals who inherit two copies of the recessive allele, one from each parent.
• Sex-linked vs Autosomal: The pattern observed in the chart does not exhibit a typical sex-linked pattern, as sex-linked traits would generally affect more males than females, which is not the case here.
• Dominant vs Recessive: Dominant traits usually appear in every generation, while recessive traits may skip generations, as seen here.
• Conclusion: Based on the analysis, the pedigree chart represents an autosomal recessive inheritance pattern.