Genetics Quiz
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Inheritance and
Variation
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1. Father of genetics is:
A. Mendel
B. Darwin
C. Muller
D. Bateson
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2. Phenotypic monohybrid ratio is:
A. 9 : 3 : 3 : 1
B. 1 : 2 : 1
C. 3 : 1
D. 2 : 1
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3. A single recessive allele will
produce its phenotypic effect when it occures on:
A. Any chromosome
B. An autosome
C. X-chromosome of female
D. X-chromosome of male
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4. Sickle cell anaemia is:
A. Autosomal heriditary disease
B. Allosomic heriditary disease
C. Epistatic effect
D. Nutritional disorder
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5. In multiple allele system, a
gamate has alleles:
A. One
B. Two
C. Three
D. many
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6. Mendel's first law is law of:
A. Paired factors
B. Dominance
C. Segregation
D. Independent assortment
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7. A gene influencing many traits
is:
A. Additive
B. Pleiotropic
C. Epistatic
D. Supplementary
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8. A genetic disorder in Africans
which reduces oxygen uptake is:
A. Phenylketonuria
B. Haemophilia
C. Colour blindness
D. Sickle cell anaemia
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9. Discontinous variations are due
to:
A. Crossing over
B. Mutations
C. Segregation of chromosomes
D. Independent assortment
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10. Exchange of segments between
non homologous chromososmes is called:
A. Crossing over
B. Inversion
C. Duplication
D. Translocation
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11. A couple has two girls. the
probability of a third girl baby is:
A. 100%
B. 50%
C. 25%
D. 12.5%
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12. Sex chromososmes are also
called:
A. Allosomes
B. Hetrosomes
C. Autosomes
D. Euchromosomes
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13. Dihybrid test cross is:
A. 1 : 1 : 1 : 1
B. 1 : 1
C. 9 : 3 : 3 : 1
D. 15 : 1
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14. Match the condition with
chromosomal abnorm lity or linkage.
A. Colour blindness-- Y-linked
B. Erythroblastosis fetalis--
X-linked
C. Klinfelter's syndrome-- 44 +
XXY
D. Down's syndrome-- 44 + XO
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15. Trisomy 21 is otherwise
called:
A. Klinfelter's syndrome
B. Turner's syndrome
C. Sickle cell anaemia
D. Down's syndrome
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16. Variations occure during
meosis due to:
A. Crossing over
B. Independent assortment
C. Linkage
D. Disjunction
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17. Polygenic inheritance occures
in:
A. Human eye colour and sickle
cell anaemia
B. Hair pigment in mouse and
tongue rolling in humans
C. Human height and skin colour
D. ABO blood group in human
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18. Phenomenon of one gene
controlling several phenotypes is;
A. Epistatsis
B. Pleiotropism
C. Codominance
D. Multiple allelism
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19. A human male produces sperms
with genotypes AB, Ab, aB, and ab in equal proportions. What is the genotype
of the person?
A. AA Bb
B. AA BB
C. Aa Bb
D. Aa BB
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20. Gene for right handedness is
dominant over the gene for left handedness. Most probable genotypes of two
right handed parents with left handed child is;
A. RR x rr
B. rr x Rr
C. RR x Rr
D. Rr x Rr
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21. Genes present on the same
locus but having different expressions are:
A. Multiple alleles
B. Polygenes
C. Oncogenes
D. Codominants
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22. Individuals with blood group A
has
A. Antigen A, antibody B
B. Antigen B, antibody A,
C. Antigen A, antibody b
D. Antigen A, no antibody.
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23. Ratio of 9:3:3:1 is due to:
A. Independent assortment of genes
B. Segregation of charecters
C. Crossing over of chromosomes
D. Homologous pairing between
chromosomes
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24. An O-group child cannot have
parents of blood groups:
A. B and B
B. A and B
C. O and O
D. AB and O
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25. Genes expressed only in
homozygous state are:
A. dominant
B. recessive
C. codominant
D. mutated
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1.
A
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2.
C
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3.
D
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4.
A
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5.
A
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6.
C
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7.
B
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8.
D
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9.
B
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10.
D
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11.
B
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12.
A
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13.
A
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14.
C
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15.
D
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16.
A
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17.
C
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18.
B
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19.
C
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20.
D
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21.
A
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22.
C
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23.
A
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24.
D
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25.
B
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