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Solution


Q.

In the following human pedigree, the filled symbols represent the affected individuals. Identify the type of given pedigree.           [2015]
1 Autosomal recessive  
2 X-linked dominant  
3 Autosomal dominant  
4 X-linked recessive  

Ans.

(1)

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.