31.Which of the following malocclusion has about 75% of hereditary component associated with it?

1. Class I.2.II.3.III.
4. Both 1 and 3.

ANS.3


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30.Which of the following is also known as scissors bite?

1. Simple posterior cross bite. 2. Buccal non occlusion.
3. Lingual non occlusion. 4. None of the above.

ANS. 2


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