Which of the following shows linkage group in coupling phase?

(1)  A           B
a            b

(2)  A           b 
a            B

(3)  A           b
a            b

(4)  a           B
a            b

Subtopic:  Understanding Linkage |
 63%
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A pure breeding pea plant with the dominant phenotype of character A and recessive phenotype of character B was crossed with another pure breeding plant with the recessive phenotype of character A and dominant phenotype character B. Offspring of this cross was crossed with a homozygous recessive for both the characters A and B. The following results were obtained. 

22 were phenotypically dominant of A and recessive of B

22 were phenotypically recessive for both A and B

22 were phenotypically recessive for A and dominant for B

22 were phenotypically dominant for both A and B 

The results show that 

(1) genes A and B are linked

(2) independent segregation of genes A and B

(3) Mendelian dihybrid inheritance

(4) polygenic inheritance.

Subtopic:  Dihybrid Cross Analysis |
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An inherited character and its detectable variant is termed as

(1) unit factor

(2) trait

(3) genetic profile

(4) genotypic charcter

Subtopic:  Monohybrid Cross: 1 |
 59%
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Which of the following is not an autosomal genetic disorder ?

(1) Sickle-cell anaemia

(2) Cystic fibrosis

(3) Haemophilia

(4) Huntington's disease

Subtopic:  Mendelian Disorders |
 74%
From NCERT
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Study the pedigree chart of a family showing the inheritance of myotonic dystrophy.

 

The trait under study is 

1. dominant X-linked

2. recessive X-linked

3. autosomal dominant

4. recessive Y-linked.

Subtopic:  Pedigree Analysis: Problem Solving |
 74%
From NCERT
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The ratio in a dihybrid test cross between two individuals is given by

(1) 2:1

(2) 1:2:1

(3) 3:1

(4) 1:1:1:1

Subtopic:  Dihybrid Cross Analysis |
 68%
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A point mutation comprising the substitution of a purine by pyrimidine is called

(1) transition

(2) translocation

(3) deletion

(4) transversion

Subtopic:  Recombination Gene Mapping |
 53%
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Pure line breed refers to

(1) heterozygosity only

(2) heterogyzosity and linkage

(3) homozygosity only

(4) homozygosity and self assortment.

Subtopic:  Monohybrid Cross: 1 |
 62%
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Given below is a pedigree chart showing the inheritance of a certain sex-liniked trait in humans. 

The Trait traced in the above pedigree chart is 

(1) dominant X-linked 

(2) recessive X-linked

(3) dominant Y-linked

(4) recessive Y-linked

Subtopic:  Pedigree Analysis: Problem Solving |
 65%
AIIMS - 2005
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The "cri-du-chat" syndrome is caused by change in chromosome structure invloving

(1) deletion

(2) duplication

(3) inversion

(4) translocation

Subtopic:  Recombination Gene Mapping |
 66%
AIIMS - 2005
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