Which one of the following pairs of features is a good example of polygenic inheritance?

(1) Human height and skin colour

(2) ABO blood group in humans and flower colour of Mirabilis jalapa

(3) Hair pigment of mouse and tongue rolling in humans

(4) Human eye colour and sickle cell anaemia

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Mating of an organism to a double recessive in order to determine whether it is homozygous or heterozygous for a character under consideration is called

(1) reciprocal cross

(2) test cross

(3) dihybrid cross

(4) back cross

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Given below is a highly simplified representation of the human sex chromosomes from a karyotype.

The gene a and b could be of

(1) colour blindness and body height

(2) attached ear lobe and Rhesus blood group

(3) haemophilia and red-green colour blindness

(4) phenylketonuria and haemophilia

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In which one of the following combinations (a-d) of the number of chromosomes is the present day hexaploid wheat correctly represented?

Combination  

Monosomic  

Haploid  

Nullisomic  

Trisomic

     (1)

     21

   28

     42

   43

     (2)

     7

   28

     40

   42

     (3)

     21

   7

     42

   43

     (4)  

     41

   21

     40

   43

 

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XO-chromosomal abnormality in human beings causes

(1) Turner's syndrome

(2) Down's syndrome

(3) Kilnefelter's syndrome

(4) none of these.

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If a homozygous red-flowered plant (dominant)is crossed with a homozygous white-flowered plant, the offsprings will be

(1) half-white flowered

(2) half red-flowered

(3) all white-flowered

(4) all red-flowered

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Gene which suppresses other gene's activity but does not lie on the same locus is called as 

(1) epistatic

(2) supplemetary

(3) hypostatic

(4) codominant

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The distance between two genes in a chromosome is measured in cross-over units which represent

(1) ratio of crossing over between them

(2) percentage of crossing over between them

(3) number of crossing over between them

(4) none of these

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How many genome types are present in a typical green plants cell?

(1) More than Five

(2) More than Ten

(3) Two

(4) Three

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Percentage of recombination between A and B is 9%, A and C is 17%, B and C is 26%, then the arrangement of genes is 

(1) ABC

(2) ACB

(3) BCA

(4) BAC

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