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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Given below is a pedigree chart of a family with five children. It shows the inheritance of attached ear-lobes as opposed to the free ones. The squares represent the male individuals and circles the females individuals. Which one of the foloowing conclusions drawn is correct?

(1) The parents are homozygous recessive.

(2) The trait is Y-linked.

(3) The parents are homozygous dominant.

(4) The parents are heterozygous.

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How many different types of gametes can be formed by F1 progeny, resulting from the following cross:

AA BB CC X aa bb cc

(1) 3

(2) 8

(3) 27

(4) 64

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