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Down's syndrome occurs as a result of

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Important Questions on Heredity and Variation

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12th West Bengal Board
IMPORTANT
A TEXT BOOK OF BIOLOGY CLASS 12>Chapter 5 - Heredity and Variation>EXERCISE>Q 39
Indicate, the inheritance of which of the following is controlled by multiple alleles
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12th West Bengal Board
IMPORTANT
A TEXT BOOK OF BIOLOGY CLASS 12>Chapter 5 - Heredity and Variation>EXERCISE>Q 40
Which of the following conditions is related for haemophilia?
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12th West Bengal Board
IMPORTANT
A TEXT BOOK OF BIOLOGY CLASS 12>Chapter 5 - Heredity and Variation>EXERCISE>Q 41
The plant in which Hugo de Vries introduced the concept of mutation 
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12th West Bengal Board
IMPORTANT
A TEXT BOOK OF BIOLOGY CLASS 12>Chapter 5 - Heredity and Variation>EXERCISE>Q 42
Which one of the following conditions in humans is correctly matched with its chromosomal abnormality/linkage? 
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12th West Bengal Board
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A TEXT BOOK OF BIOLOGY CLASS 12>Chapter 5 - Heredity and Variation>EXERCISE>Q 43
The phenomenon of single gene-regulating several phenotypes is called
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12th West Bengal Board
IMPORTANT
A TEXT BOOK OF BIOLOGY CLASS 12>Chapter 5 - Heredity and Variation>EXERCISE>Q 44
When a dihybrid cross is fit into a Punnett square with 16 boxes, the maximum number of different phenotypes available are 
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12th West Bengal Board
IMPORTANT
A TEXT BOOK OF BIOLOGY CLASS 12>Chapter 5 - Heredity and Variation>EXERCISE>Q 45
Sex chromosomes of a female bird are represented by
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12th West Bengal Board
IMPORTANT
A TEXT BOOK OF BIOLOGY CLASS 12>Chapter 5 - Heredity and Variation>EXERCISE>Q 46
In a pedigree analysis, [] = 0 represents parent