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4.Principles of Inheritance and Variation
medium
In the following human pedigree, the filled symbols represent the affected individuals. Identify the type of given pedigree.
A
Autosomal recessive
B
$X$-linked dominant
C
Autosomal dominant
D
$X$-linked recessive
(NEET-2015)
Solution
(a) : Autosomal recessive traits are the traits which are caused by recessive autosomal genes when present in homozygous condition. The given pedigree can be explained as:As the trait appears only in homozygous recessive individuals $(aa)$, therefore it is an autosomal recessive trait.
Standard 12
Biology
