Multiple Choice Questions and Answers on Animal Biotechnology Chromosomes
Question 1 : Exchange of segments between non homologous chromosomes is best known as
- translation
- translocation
- recombination
- crossing over
Answer : 2
Question 2 : How does dosage compensation in Drosophila occur?
- Hypertranscription of male X chromosome
- Hypotranscription of female X chromosome
- X inactivation in females
- Chimerism
Answer : 1
Question 3 : Hairy wing character of Drosophila is due to
- duplication in region of chromosome
- deletion in region of chromosome
- due to presence of additional X-chromosome
- 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
- zymogram
- chromogram
- idiogram
- karyogram
Answer : 3
Question 5 : A cross shaped (+) or a ring involving four chromosomes may be formed during metaphase I in case of
- translocation heterozygote
- deficiency
- haploid organism
- duplication
Answer : 1
Question 6 : Incase of inversion when the inverted segment of chromosome includes centromere, it is known as
- paracentric inversion
- double inversion
- inverted inversion
- 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
- 1:2:2:1
- 9:3:3:1
- 3:1:1:3
Answer : 1
Question 8 : In an organism, the chromosome number is maintained constant because of
- independent assortment
- crossing over
- DNA duplication
- synapsis
Answer : 3
Question 9 : How many chromosomes are there in the budding yeast (S. cerevisiae)?
- 16
- 17
- 18
- 20
Answer : 1
Question 10 : Which of the following is correct when a character shows continuous variation assuming a normal distribution?
- It is governed by many genes with small cumulative effect
- It is not controlled genetically
- Many of the variation is due to fluctuation of climate
- None of the above
Answer : 1
Question 11 : Raphanobrassica is a classical example of
- aneuploidy
- nullisomy
- allopolyploidy
- 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
- penetrance
- expressivity
- inheritance strength
- environmental influence
Answer : 2
Question 13 : How many chromosomes are there in Caernorhabditis elegans?
- 3
- 6
- 9
- 12
Answer : 2
Question 14 : If two genes show 50% recombination
- they are on different chromosomes
- they are on same chromosome but far apart
- both (1) and (2)
- they are closely located on the same chromosome
Answer : 3
Question 15 : Which of the following denotes a pair of contrasting characters?
- Alleles
- Phenotype
- Homozygous
- Genotype
Answer : 1
Question 16 : A map of chromosomes that utilizes cloned and sequenced DNA fragments rather than genetic markers is known as
- a physical map
- a genetic map
- a cloning map
- 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
- pericentric inversion
- paracentric inversion
- double inversion
- none of these
Answer : 2
Question 18 : The percentage of individual with a given genotype, which exhibits the associated phenotype, is defined as
- penetrance
- expressivity
- inheritance percent
- environmental influence
Answer : 1
Question 19 : Diethyl stilbestrol (DES), a synthetic estrogen causes
- chromosome lagging
- disruption of mitotic spindle
- centriole elongation
- all of the above
Answer : 4
Question 20 : Bar eye character of Drosophila is due to
- duplication in region of 16A of X chromosome
- deletion in region of 16A of X chromosome
- due to presence of additional X-chromosome
- 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
- holandric inheritance
- quantitative inheritance
- criss-cross inheritance
- maternal inheritance
Answer : 3