Consider the following eye disorders 1. Cataract 2. Colour blindness 3. Night blindness Which of the above disorders is/are essentially genetic in nature ?

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Q: 70 (CDS-I/2005)
Consider the following eye disorders
1. Cataract
2. Colour blindness
3. Night blindness
Which of the above disorders is/are essentially genetic in nature ?

question_subject: 

Science

question_exam: 

CDS-I

stats: 

0,15,38,7,20,11,15

keywords: 

{'eye disorders': [0, 0, 1, 0], 'night blindness': [3, 0, 0, 1], 'colour blindness': [2, 0, 1, 0], 'above disorders': [0, 0, 1, 0], 'cataract': [0, 0, 1, 1], 'nature': [5, 1, 15, 25]}

Option 1: 1 and 2. This option suggests that both cataract (disorder 1) and color blindness (disorder 2) are essentially genetic in nature. Cataract is a clouding of the lens in the eye, which can be caused by various factors including genetic mutations. In some cases, cataracts can be inherited from parents. Color blindness, on the other hand, is a genetic condition that affects a person`s ability to perceive colors correctly. It is primarily caused by inherited genetic mutations that affect the photopigments in the cone cells of the retina.

Option 2: 2 only. This option indicates that only color blindness (disorder 2) is genetic in nature. As explained above, color blindness is a genetic condition caused by inherited genetic mutations that affect the photopigments in the cone cells of the retina.

Option 3: 1 and 3. This option suggests that both cataract (disorder 1) and night blindness (disorder 3) are essentially genetic in nature. However, this is incorrect as night blindness is often caused by vitamin A deficiency or other non-genetic factors, in addition to certain genetic conditions.

Option 4: 2 and 3