Biology - Principles of Inheritance and Variation Question with Solution | TestHub
Study the following statements and select the correct option:
Statement (I): Examples of Mendelian disorders are Turner's syndrome and Down's syndrome.
Statement (II): Mendelian disorders are caused due to alternation or mutation in the gene.
Statement (III): Chromosomal disorders are caused due to the absence or excess of one or more chromosomes
Options:
Answer:
Solution:
Statement I is incorrect because Turner's syndrome and Down's syndrome are examples of chromosomal disorders, not Mendelian disorders. Examples of Mendelian disorders include haemophilia, cystic fibrosis, sickle-cell anaemia, etc.
Statement II is correct as Mendelian disorders are mainly determined by alteration or mutation in a single gene.
Statement III is correct as chromosomal disorders are caused due to the absence or excess or abnormal arrangement of one or more chromosomes.
Therefore, Statement I is incorrect and Statements II and III are correct.
Answer: Statement I is incorrect and II, III are correct
