Consider the following disorders:

1. Haemophilia
2. Cystic fibrosis
3. Sickle-cell anaemia
4. Down’s Syndrome

How many of the above are Mendelian disorders?

Question

Consider the following disorders: 1. Haemophilia 2. Cystic fibrosis 3. Sickle-cell anaemia 4. Down’s Syndrome How many of the above are Mendelian disorders?

Quintessence Classes · Accepted Answer

The correct answer is Only three. The first three disorders (Haemophilia, Cystic fibrosis, and Sickle-cell anaemia) are classified as Mendelian disorders, while Down’s Syndrome is classified as a Chromosomal disorder.Explanation of the DisordersHaemophilia: A sex-linked recessive Mendelian disorder where the blood fails to clot properly.Cystic Fibrosis: An autosomal recessive Mendelian disorder affecting the lungs and digestive system.Sickle-cell Anaemia: An autosomal recessive Mendelian disorder where hemoglobin molecules are shaped like sickles, obstructing blood flow.Down’s Syndrome: This is not a Mendelian disorder. It is caused by the presence of an extra copy of chromosome number 21 (Trisomy 21).

Answer

Only one

Answer

Only two

Answer

All

Consider the following disorders:

1. Haemophilia
2. Cystic fibrosis
3. Sickle-cell anaemia
4. Down’s Syndrome

How many of the above are Mendelian disorders?

Answer & Explanation

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JKPSC JKAS 2023 Prelims

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