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Home Biotechnology Animal Biotechnology Chromosomes Comments

  • Question
  • Diethyl stilbestrol (DES), a synthetic estrogen causes


  • Options
  • A. chromosome lagging
  • B. disruption of mitotic spindle
  • C. centriole elongation
  • D. all of the above

  • Correct Answer
  • all of the above 


  • Animal Biotechnology Chromosomes problems


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    • 1. In a dihybrid cross, the progeny of an Fl individual (hetero2ygous for both characters) will show a phenotypic ratio of

    • Options
    • A. 1:1:1:1
    • B. 1:2:2:1
    • C. 9:3:3:1
    • D. 3:1:1:3
    • Discuss
    • 2. Which of the following is correct when a character shows continuous variation assuming a normal distribution?

    • Options
    • A. It is governed by many genes with small cumulative effect
    • B. It is not controlled genetically
    • C. Many of the variation is due to fluctuation of climate
    • D. None of the above
    • Discuss
    • 3. The degree or extent to which a given genotype is expressed phenotypically in a particular individual is defined as

    • Options
    • A. penetrance
    • B. expressivity
    • C. inheritance strength
    • D. environmental influence
    • Discuss
    • 4. Raphanobrassica is a classical example of

    • Options
    • A. aneuploidy
    • B. nullisomy
    • C. allopolyploidy
    • D. None of the above
    • Discuss
    • 5. A cross shaped (+) or a ring involving four chromosomes may be formed during metaphase I in case of

    • Options
    • A. translocation heterozygote
    • B. deficiency
    • C. haploid organism
    • D. duplication
    • Discuss
    • 6. The percentage of individual with a given genotype, which exhibits the associated phenotype, is defined as

    • Options
    • A. penetrance
    • B. expressivity
    • C. inheritance percent
    • D. environmental influence
    • Discuss
    • 7. 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

    • Options
    • A. pericentric inversion
    • B. paracentric inversion
    • C. double inversion
    • D. none of these
    • Discuss
    • 8. How many chromosomes are there in Caernorhabditis elegans?

    • Options
    • A. 3
    • B. 6
    • C. 9
    • D. 12
    • Discuss
    • 9. Which of the following denotes a pair of contrasting characters?

    • Options
    • A. Alleles
    • B. Phenotype
    • C. Homozygous
    • D. Genotype
    • Discuss
    • 10. If two genes show 50% recombination

    • Options
    • A. they are on different chromosomes
    • B. they are on same chromosome but far apart
    • C. both (a) and (b)
    • D. they are closely located on the same chromosome
    • Discuss


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