Our ancestors knew about the inheritance of characters and variations because-

(1) They selectively breed plants and animals and selected for organisms that possessed desirable characters.

(2) They introduced mutations

(3) They performed natural hybridisation

(4) All of the above

Subtopic:  Introduction to Genetics: 1 |
 54%
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Monohybrid cross can be defined as

(1) Cross between plants differing in one chromosome

(2) Cross between plants differing in one character only

(3) Cross between plants differing in two traits

(4) All of the above

Subtopic:  Monohybrid Cross: 1 |
 68%
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Types of gametes produced by a homozygous parent

(1) many

(2) single type

(3) depends upon number of genes

(4) depends upon number of chromosomes

Subtopic:  Monohybrid Cross: 1 |
 87%
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If a man consists of an extra copy of chromosome number 18, then the condition is known as

(1) Monosomy

(2) Trisomy

(3) Nullisomy

(4) Polyploidy

Subtopic:  Non - Disjunction & Aneuploidy |
 84%
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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%
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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 |
 78%
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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 |
 93%
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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 |
 92%
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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 |
 89%
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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 |
 83%
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