Answer :
Hereditary disorder is the disorder caused by change in one's DNA sequence. These are of three types single gene disorder, chromosomal disorder and complex disorder.
What is Hereditary disorder?
A hereditary disorder is caused by changes in DNA. This will get transmitted to the next generations through genes.
There are mainly of three types. They are:
- Single-gene disorder: only one gene is affected.
- Chromosomal disorder: here chromosomes are either missing or changed.
- Complex disorder: when two or more genes are affected.
Thus, option a is correct.
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