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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Which of the following is not a X-linked recessive disease?

(1) Haemophilia 

(2) Colour blindness

(3) β thalassemia

(4) Glucose-6-phosphate dehydrogenase deficiency.

Subtopic:  Mendelian Disorders: Thalassemia |
 70%
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A pure tall red plant is crossed with a pure dwarf white plant. The progenies thus produced in F1 generations are selfed. The different types of gametes that will be produed in F2 generaion will be

(1) 2

(2) 4

(3) 8

(4) 16

Subtopic:  Dihybrid Cross Analysis |
 61%
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Which of the following chromosomal disorders is the commonest in the new borns?

(1) Edward's syndrome

(2) Patau's syndrome

(3) Down's syndrome

(4) None of these. 

Subtopic:  Non - Disjunction & Aneuploidy |
 72%
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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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A diagramatic representation of karyotype of a species is referred to as its

(1) idiogram

(2) hologram

(3) karyogram

(4) Both 1 and 3

Subtopic:  Recombination Gene Mapping |
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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%
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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%
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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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