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Who reported that Down's syndrome is due to extra 21st chromosome

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Important Questions on Principles of Inheritance and Variation

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NTA Errorless Biology Volume-2>Chapter 5 - Principles of Inheritance and Variation>Ordinary Thinking>Q 75
In agriculture mutation caused by a mutagen is
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NTA Errorless Biology Volume-2>Chapter 5 - Principles of Inheritance and Variation>Ordinary Thinking>Q 76
Discontinuous variations are
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The reason of fault in gene duplication is
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NTA Errorless Biology Volume-2>Chapter 5 - Principles of Inheritance and Variation>Ordinary Thinking>Q 77
Epicanthal skin fold and simian crease are characteristics of
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NTA Errorless Biology Volume-2>Chapter 5 - Principles of Inheritance and Variation>Ordinary Thinking>Q 78
UV radiations cause
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NTA Errorless Biology Volume-2>Chapter 5 - Principles of Inheritance and Variation>Ordinary Thinking>Q 79
A person may have one gene for normal haemoglobin and one gene for sickle cell haemoglobin. This heterozygous condition is called
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NTA Errorless Biology Volume-2>Chapter 5 - Principles of Inheritance and Variation>Ordinary Thinking>Q 80
A diploid cell is treated with colchicine. It becomes
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NTA Errorless Biology Volume-2>Chapter 5 - Principles of Inheritance and Variation>Ordinary Thinking>Q 81
Which one of the following mutation partially or fully reverses the harmful effects of previous mutation
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NTA Errorless Biology Volume-2>Chapter 5 - Principles of Inheritance and Variation>Ordinary Thinking>Q 82
Polydactyly in man is due to