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%
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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%
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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%
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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 |
 91%
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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%
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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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An abnormal human baby with 'XXX' sex chromosomes was born due to

1. formation of abnormal sperms in the father

2. formation of abnormal ova in the mother

3. fusion of two ova and one sperm

4. fusion of two ova and two sperm

Subtopic:  Non - Disjunction & Aneuploidy |
NEET - 2015
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Alleles are

1. different phenotype

2. true breeding homozygotes

3. different molecular forms of a gene

4. heterozygotes

Subtopic:  Monohybrid Cross: 1 |
 79%
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NEET - 2015
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Fruit color in squash is an example of 

(1) recessive epistatis

(2) dominant epistatis

(3) complementary genes

(4) inhibitory genes

Subtopic:  Epistasis |
 57%
NEET - 2014
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