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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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%
From NCERT
NEET - 2015
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A human female with turner's syndrome

(1) has 45 chromosomes with XO

(2) has one additional X-chromosome

(3) exhibits male characters

(4) is able to produce children with normal husband

Subtopic:  Sex Aneuploidy - Turner & Klinefelter Syndrome |
 84%
From NCERT
NEET - 2014
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Which of the following statements is not true of two genes that show 50% recombination frequency?

(1) the genes may be on different chromosomes 

(2) the genes are tightly linked

(3) the genes show independent assortment

(4) If the genes are present on the same chromosome, they undergo more than one crossovers in every meiosis

 

Subtopic:  Recombination Gene Mapping |
 54%
From NCERT
NEET - 2013
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