Grain colour in wheat is determined by three pairs of polygenes. Following the cross AABBCC (dark colour) X aabbcc (light colour), in F2 generation what proportion of the progeny is likely to resemble either parent?

(1) None

(2) Less than 5 percent

(3) One third

(4) Half

Subtopic:  Dihybrid Cross: Details |
 51%
AIIMS - 2005
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Primary source of allelic variation is 

(1) independent assorment

(2) recombination

(3) mutation

(4) polyploidy

Subtopic:  Recombination Gene Mapping |
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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

Subtopic:  Polygenic Inheritance & Pleiotropy |
 88%
From NCERT
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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

Subtopic:  Monohybrid Cross: Further Understanding |
 90%
From NCERT
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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

Subtopic:  Mendelian Disorders: Hemophilia |
 72%
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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

 

Subtopic:  Non - Disjunction & Aneuploidy |
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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.

Subtopic:  Sex Aneuploidy - Turner & Klinefelter Syndrome |
 87%
From NCERT
AIIMS - 2007
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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

Subtopic:  Epistasis |
 78%
AIIMS - 2007
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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

Subtopic:  Recombination Gene Mapping |
 81%
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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

Subtopic:  Introduction to Genetics: 2 |
 56%
AIIMS - 2008
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