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Total Questions : 49 | Page 3 of 5 pages
Question 21. Exchange of segments between non homologous chromosomes is best known as
  1.    crossing over
  2.    translocation
  3.    translation
  4.    recombination
 Discuss Question
Answer: Option B. -> translocation
Question 22.  An odd number of cross overs in inverted region will result into formation of a dicentric chromatid and acentric chromatid at anaphase I incase of
  1.    pericentric inversion
  2.    paracentric inversion
  3.    double inversion
  4.    none of these
 Discuss Question
Answer: Option B. -> paracentric inversion
Question 23.  Bar eye character of Drosophila is due to
  1.    duplication in region of 16A of X chromosome
  2.    deletion in region of 16A of X chromosome
  3.    due to presence of additional X-chromosome
  4.    due to a point mutation in eye-locus
 Discuss Question
Answer: Option A. -> duplication in region of 16A of X chromosome
Question 24.  Transmission of a gene from male parent to female child to male grand child is known as
  1.    holandric inheritance
  2.    quantitative inheritance
  3.    criss-cross inheritance
  4.    maternal inheritance
 Discuss Question
Answer: Option C. -> criss-cross inheritance
Question 25.  The percentage of individual with a given genotype, which exhibits the associated phenotype, is defined as
  1.    penetrance
  2.    expressivity
  3.    inheritance percent
  4.    environmental influence
 Discuss Question
Answer: Option A. -> penetrance
Question 26.  Diethyl stilbestrol (DES), a synthetic estrogen causes
  1.    chromosome lagging
  2.    disruption of mitotic spindle
  3.    centriole elongation
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above
Question 27.  The degree or extent to which a given genotype is expressed phenotypically in a particular individual is defined as
  1.    penetrance
  2.    expressivity
  3.    inheritance strength
  4.    environmental influence
 Discuss Question
Answer: Option B. -> expressivity
Question 28.  How many chromosomes are there in Caernorhabditis elegans?
  1.    3
  2.    6
  3.    9
  4.    12
 Discuss Question
Answer: Option B. -> 6
Question 29.  If two genes show 50% recombination
  1.    they are on different chromosomes
  2.    they are on same chromosome but far apart
  3.    both (a) and (b)
  4.    they are closely located on the same chromosome
 Discuss Question
Answer: Option C. -> both (a) and (b)
Question 30.
In a dihybrid cross, the progeny of an Fl individual (hetero2ygous for both characters) will show a phenotypic ratio of
  1.    1:1:1:1
  2.    1:2:2:1
  3.    9:3:3:1
  4.    3:1:1:3
 Discuss Question
Answer: Option A. -> 1:1:1:1

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