Test cross involves :

(1) crossing between two geneotypes with recessive trait

(2) crossing between two F1 hybrids

(3) crossing the F1 hybrid with a double recessive genotype

(4) crossing between two genotypes with dominant trait

Subtopic:  Monohybrid Cross: Further Understanding |
 71%
From NCERT
NEET - 2006
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If a colourblind woman marries a normal visioned man, their sons wil be :

(1) all normal visioned

(2) one-half colourblind and one-half normal 

(3) three-fourths colourblind and one-fourth normal

(4) all colourblind

Subtopic:  Sex Linked Recessive Inheritance |
 66%
NEET - 2006
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Cri-du-chat syndrome in humans is caused by the :

(1) fertilization of an XX egg by a normal Y-bearing sperm

(2) loss of half of the short arm of chromosome 5

(3) loss of half of the long arm of chromosome 5

(4) trisomy of 21st chromosome.

Subtopic:  Recombination Gene Mapping |
 63%
NEET - 2006
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Sickle cell anaemia has not been eliminated from the African population because :

(1) it is controlled by recessive genes

(b) it is not a fatal disease

(3) it provides immunity against malaria

(4) it is controlled by a dominant genes

Subtopic:  Mendelian Disorders: Sickle Cell Anemia |
 67%
NEET - 2006
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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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Which pair is incorrect?

(1) Haemophilia - X linked recessive

(2) baldness - X- linked dominance

(3) colour blindness- X linked recessive

(4) antler in deer - sex limited.

Subtopic:  Conclusion |
 79%
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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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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%
From NCERT
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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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