The gene for eye color in a certain organism has seven alleles. How many genotypic combinations are possible?

  1. 2
  2. 14
  3. 28
  4. 56
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You are studying the genetics of bean pigmentation in a particular variety of bean plant. A bean plant that produces grey beans is self-pollinated and the numbers of each progeny type produced are - 50 white beans 107 grey beans 38 black beans. Assuming that TWO genes govern the bean pigmentation trait, the genetic hypothesis that best explains the inheritance pattern of bean pigmentation would be:

  1. dominant/recessive
  2. incomplete dominance
  3. incomplete penetrance
  4. recessive epistasis
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In chickens, gene R produces a rose-shaped comb, gene r produces a single comb, gene P produces pea-shaped comb and gene p produces a single comb. When P and R are both present in the genotype, the comb is walnut shaped. Two chickens with genotype RrPp are intercrossed. What will be the ratio of Walnut shaped, Rose shaped, Pea shaped and single comb progeny respectively:

  1. 3 : 1 : 1 : 3
  2. 1 : 1: 1 : 1
  3. 9 : 3 : 3 : 1
  4. 12 : 3 : 4
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Two pure lines of corn have mean cob lengths of 9 and 3 inches respectively. The polygenes involved in this trait all exhibit additive gene action. Crossing these two lines is expected to produce a progeny with mean cob length [in inches] of:

  1. 12.0
  2. 7.5
  3. 6.0
  4. 2.75
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Diseases that are caused by the malfunction of a pleiotropic gene are:

  1. cured by dietary restrictions
  2. reversible by gene therapy
  3. called as syndromes
  4. extremely rare
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Out of a pair of monozygotic twins, one develops hare lip and the other does not. This can be an example of the genetic phenomenon of:

  1. Pleiotropy
  2. Incomplete penetrance
  3. Variable expressivity
  4. Incomplete dominance
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The mapping of genes on chromosome was attempted by

(1) T. H. Morgan

(2) Walter Sutton

(3) Alfred Sturtevant

(4) Henking

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Today ________ are extensively used as a _______ point in the sequencing of whole genome

(1) Pedigree charts, conclusive

(2) Genetic maps, starting

(3) Pedigree charts, starting

(4) Genetic maps, conclusive

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The initial studies for sex determination were done over

(1) Plants

(2) Insects

(3) Humans

(4) Hen

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The concept of X body was given by

(1) T. H. Morgan

(2) Walter Sutton

(3) Alfred Sturtevant

(4) Henking

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