Disorder caused by the trisomy of chromosome number 21

(1) Klinefelter’s syndrome

(2) Turner’s syndrome

(3) Down’s syndrome

(4) Phenylketonuria

Subtopic:  Non - Disjunction & Aneuploidy |
 89%
From NCERT
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Down’s syndrome was first described in the year

(1) 1962

(2) 1866

(3) 1856

(4) 1863

Subtopic:  Non - Disjunction & Aneuploidy |
 60%
From NCERT
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Gynaecomastia refers to

1. Masculine development in females

2. Development of breasts in males

3. Development of female characters in male

4. Reduced breasts in the female

Subtopic:  Sex Linked Inheritance: Characteristics |
 76%
From NCERT
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In humans karyotype of 47, XXY leads to  

(1) Klinefelter’s syndrome

(2) Turner’s syndrome

(3) Down’s syndrome

(4) Edward’s syndrome

Subtopic:  Sex Aneuploidy - Turner & Klinefelter Syndrome |
 92%
From NCERT
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Furrowed tongue and partially open mouth are characteristics of

(1) Edward’s syndrome

(2) Turner’s syndrome

(3) Down’s syndrome

(4) Klinefelter’s syndrome.

Subtopic:  Non - Disjunction & Aneuploidy |
 91%
From NCERT
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      Column I      Column II  
i. Down’s syndrome a. Broad palm with characteristic palm crease
ii. Klinefelter’s syndrome    b. Gynaecomastia
iii. Turner’s syndrome c. rudimentary ovaries
d. XO
e. XXY
f. physical development is retarded.

Choose the correct match:

1. i-c,d; ii-b,e,f; iii-a

2. i-e,c; ii-b,f; iii-a,d

3. i-a; ii-b,e,f; iii-c,d

4. i-a,c; ii-d,e; iii-b,d

Subtopic:  Sex Aneuploidy - Turner & Klinefelter Syndrome |
 87%
From NCERT
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Turner’s syndrome is caused by

(1) Absence of Y chromosome

(2) Absence of one of the ‘X’ chromosome

(3) Trisomy of chromosome number 21

(4) Additional copy of chromosome ‘X’.

Subtopic:  Sex Aneuploidy - Turner & Klinefelter Syndrome |
 81%
From NCERT
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What will be the ratio of homozygous dominant, homozygous recessive and pure heterozygous traits in F2 generation in pea plant is

(1) 1 : 1 : 8

(2) 2 : 3 : 2

(3) 1 : 1 : 2

(4) 2 : 2 : 6

Subtopic:  Monohybrid Cross: Further Understanding |
 84%
From NCERT
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In the results, F2 generation of Mendelian dihybrid cross in pea plant. The ratio of yellow and wrinkled seeded pea plant to the yellow and round seeded pea plant is

(1) 1 : 2

(2) 1 : 4

(3) 1 : 3

(4) 3 : 5

Subtopic:  Dihybrid Cross Analysis |
 79%
From NCERT
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Law of Independent Assortment is not applicable to 

(1) Linked genes

(2) Genes on different chromosomes

(3) Distantly located gene

(4) both (2) and (3)

Subtopic:  Dihybrid Cross: Details |
 73%
From NCERT
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