In the given pedigree chart 'P' is a female suffering from a disease, which is denoted by 'A' dominant allele and 'a' recessive allele ? Find the genotype of 'P'.

$aa$

The correct answer is Option (4) → $aa$

In autosomal recessive inheritance, a genetic condition occurs when one variant is present on both alleles (copies) of a given gene.

 Autosomal recessive trait (example : sickle -cell anaemia ).

Autosomal recessive inheritance is a mode of genetic transmission in which a condition or trait is passed from parent to child. A genetic disorder occurs when a child inherits one mutated (altered) gene copy from each parent. Typically, the parents of a child with an autosomal recessive condition do not exhibit the condition themselves. These unaffected parents are referred to as carriers, as they each possess one copy of the mutated gene and have the potential to pass it on to their offspring.