If a colourblind man marries a woman who is homozygous for normal colour vision, the probalility of their son being colourblind is 

(1) 0

(2) 0.5

(3) 0.75

(4) 1

Subtopic:  Sex Linked Recessive Inheritance |
 72%
NEET - 2016
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A tall true breeding garden pea plant is crossed with a dwarf true breeding garden pea plant. When the F1 plants were selfed the resulting genotypes were in the ratio of 

(1) 1 : 2 : 1 :: Tall heterozygous : tall homozygous : Dwarf

(2) 3 : 1 :: Tall : Dwarf

(3) 3 : 1 :: Dwarf : Tall

(4) 1 : 2 : 1 :: Tall homozygous : Tall heterogygous : Dwarf

Subtopic:  Monohybrid Cross: 1 |
 73%
From NCERT
NEET - 2016
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Pick out the correct statements.

I. Haemophilia is a sex-linked recessive disease

II. Down's syndrome is due to aneuploidy.

III. Phenylketonuria is an autosomal recessive gene disorder

IV. Sickle cell anaemia is an x - linked recessive gene disorder

(1) II and IV are correct

(2) I, III and IV are correct

(3) I, II and III are correct

(4) I and IV are correct

Subtopic:  Mendelian Disorders |
 75%
From NCERT
NEET - 2016
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In a test cross involving F1 dihybrid flies, more parental-type offspring were produced than the recombinant type offspring. This indicates

(1) chromosomes failed to separate during meiosis 

(2) the two genes are linked and present on the same chromosome

(3) both of the characters are controlled by more than one gene

(4) the two genes are located on two different chromosomes

Subtopic:  Dihybrid Cross: Details |
 79%
From NCERT
NEET - 2016
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Match the terms in Column I with their description in Column II and choose the correct option.

Column I

Column II

A. Dominance

1. Many genes govern a single character

B. Codominance

2. Ina heterozygous organism only one allele expresses itself

C. Pleiotropy

3. In a heterozygous organism both alleles express themselves fully

D. Polygenic inheritance

4. A single gene influences many characters

Codes : 

 

A

B

C

D

(1)  

2   

3   

4   

1

(2)

4

1

2

3

(3)

4

3

1

2

(4)

2

1

4

3

Subtopic:  Dominance Deviation from Mendel: 2 | Polygenic Inheritance & Pleiotropy |
 87%
From NCERT
NEET - 2016
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Which of the following most appropriately describes haemophilia?

(1) X-linked recessive gene disorder

(2) Choromosomal disorder

(3) dominant gene disorder

(4) Recessive gene disorder

Subtopic:  Mendelian Disorders: Hemophilia |
 88%
From NCERT
NEET - 2016
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The term "linkage" was coined by :-

1. TH Morgan

2. T Boveri

3. G Mendel

4. W Sulton

Subtopic:  Linkage |
 90%
From NCERT
NEET - 2015
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In the following human pedigree, the filled symbols represent the affected individuals. Identify the type of given pedigree

1. Autosomal dominant

2. X-linked recessive

3. Autosomal recessive

4. X-linked dominant

Subtopic:  Pedigree Analysis: Problem Solving |
NEET - 2015
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A pleiotropic gene

1.   is expressed only in primitive plants

2.   is a gene involved during Pliocene

3.  controls a trait only in combination with another gene

4.   control multiple traits in an individual

Subtopic:  Polygenic Inheritance & Pleiotropy |
 88%
From NCERT
NEET - 2015
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Multiple alleles are present 

1. on different chromosomes

2. at different loci on the same chromosome

3. at the same locus of the chromosome

4. on non-sister chromatids

Subtopic:  Dominance Deviation from Mendel: 2 |
NEET - 2015
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