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. 

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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

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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

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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

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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.

 

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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

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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

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Pure line breed refers to

(1) heterozygosity only

(2) heterogyzosity and linkage

(3) homozygosity only

(4) homozygosity and self assortment.

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If a homozygous red flowered plant is crossed with a homozygous white flowered plant and red colour allele  is completely dominat over white colour allele, the offspring would be 

(1) half red-flowered

(2) all red-flowred

(3) half white-flowered

(4) half pink- flowered.

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One of the genes present exclusively on the X-chromosome in humans is concerned with

(1) baldness

(2) red-green colour blindness

(3) facial hair/moustaches in males

(d) night blindness

 

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