Question

Read the following statements and select the correct option.

i. Genetic disorders are broadly categorised as, Mendelian disorders and chromosomal disorders.

ii. Mendelian disorders are caused due to absence or excess of one or more chromosomes or their abnormal arrangement.

iii. Chromosomal disorders are mainly caused due to alteration or mutation in the gene.

Options

• Statements i and iii are incorrect.

• Statements i and ii are incorrect.

• Statement i is correct.

• Statements i, ii and iii are incorrect.

Answer 1

Statement i is correct.

Explanation: 

i. Mendelian disorders are caused mostly by a change or mutation in the gene.

ii. The lack or excess of one or more chromosomes, or their aberrant organisation, causes chromosomal abnormalities.