Hole in heart is not a hereditary disorder .
This is happened due to genetic variation in human.

Answer:

There are several hereditary disorders that can affect individuals, but one of the options listed above is not a hereditary disorder. Let's analyze each option to determine which one is not hereditary.

(a) Hole in heart: A hole in the heart, also known as a congenital heart defect, can be hereditary in some cases. It can be caused by genetic factors or chromosomal abnormalities that are inherited from parents. Therefore, a hole in the heart can be considered a hereditary disorder.

(b) Colour blindness: Colour blindness, also known as color vision deficiency, is a genetic disorder that is usually inherited from the mother. It affects the ability to distinguish certain colors. Therefore, colour blindness is a hereditary disorder.

(c) Night blindness: Night blindness, also known as nyctalopia, is a condition in which an individual has difficulty seeing in low-light conditions or at night. It can be caused by various factors such as vitamin A deficiency or certain genetic disorders. Some forms of night blindness can be hereditary, especially those caused by genetic mutations. Therefore, night blindness can also be considered a hereditary disorder.

(d) Achondroplasia: Achondroplasia is a genetic disorder that affects bone growth and is characterized by short stature. It is caused by a mutation in a specific gene and is inherited in an autosomal dominant pattern. This means that if one parent has achondroplasia, there is a 50% chance of passing the condition on to their children. Therefore, achondroplasia is a hereditary disorder.

Based on the analysis above, all the options listed (a, b, c, d) can be considered hereditary disorders. None of them is excluded as a non-hereditary disorder.