Animal Biotechnology Chromosomes Questions and Answers

Multiple Choice Questions and Answers on Animal Biotechnology Chromosomes

Question 1 : Exchange of segments between non homologous chromosomes is best known as

  1. translation
  2. translocation
  3. recombination
  4. crossing over

Answer : 2

Question 2 : How does dosage compensation in Drosophila occur?

  1. Hypertranscription of male X chromosome
  2. Hypotranscription of female X chromosome
  3. X inactivation in females
  4. Chimerism

Answer : 1

Question 3 : Hairy wing character of Drosophila is due to

  1. duplication in region of chromosome
  2. deletion in region of chromosome
  3. due to presence of additional X-chromosome
  4. due to a point mutation

Answer : 1

Question 4 : A diagram depicting chromosomes of haploid set of an organism ordered in a series of decreasing size is known as

  1. zymogram
  2. chromogram
  3. idiogram
  4. karyogram

Answer : 3

Question 5 : A cross shaped (+) or a ring involving four chromosomes may be formed during metaphase I in case of

  1. translocation heterozygote
  2. deficiency
  3. haploid organism
  4. duplication

Answer : 1

Question 6 : Incase of inversion when the inverted segment of chromosome includes centromere, it is known as

  1. paracentric inversion
  2. double inversion
  3. inverted inversion
  4. pericentric inversion

Answer : 4

Question 7 : 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

Answer : 1

Question 8 : In an organism, the chromosome number is maintained constant because of

  1. independent assortment
  2. crossing over
  3. DNA duplication
  4. synapsis

Answer : 3

Question 9 : How many chromosomes are there in the budding yeast (S. cerevisiae)?

  1. 16
  2. 17
  3. 18
  4. 20

Answer : 1

Question 10 : Which of the following is correct when a character shows continuous variation assuming a normal distribution?

  1. It is governed by many genes with small cumulative effect
  2. It is not controlled genetically
  3. Many of the variation is due to fluctuation of climate
  4. None of the above

Answer : 1

Question 11 : Raphanobrassica is a classical example of

  1. aneuploidy
  2. nullisomy
  3. allopolyploidy
  4. None of the above

Answer : 3

Question 12 : 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

Answer : 2

Question 13 : How many chromosomes are there in Caernorhabditis elegans?

  1. 3
  2. 6
  3. 9
  4. 12

Answer : 2

Question 14 : If two genes show 50% recombination

  1. they are on different chromosomes
  2. they are on same chromosome but far apart
  3. both (1) and (2)
  4. they are closely located on the same chromosome

Answer : 3

Question 15 : Which of the following denotes a pair of contrasting characters?

  1. Alleles
  2. Phenotype
  3. Homozygous
  4. Genotype

Answer : 1

Question 16 : A map of chromosomes that utilizes cloned and sequenced DNA fragments rather than genetic markers is known as

  1. a physical map
  2. a genetic map
  3. a cloning map
  4. none of these

Answer : 1

Question 17 : 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

Answer : 2

Question 18 : 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

Answer : 1

Question 19 : Diethyl stilbestrol (DES), a synthetic estrogen causes

  1. chromosome lagging
  2. disruption of mitotic spindle
  3. centriole elongation
  4. all of the above

Answer : 4

Question 20 : 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

Answer : 1

Question 21 : 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

Answer : 3