When genes exist in more than two allelic forms, it is multiple allelism. The genetic variation arises as a result of mutation and hence are responsible for hereditary variations. Here, three or more alleles of a gene are found to be present. This can be illustrated best in humans by the ABO blood group.
1. A person with antigens A and B and no antibodies belongs to blood group or in which blood group antibodies are absent
(a) O
(b) AB
(c) B
(d) A
Answer: (b)
2. Inheritance of ABO blood group system is an example of
(a) dominance
(b) epistasis
(c) partial dominance
(d) multiple allelism
Answer: (d)
3. During the serological test in which anti-human serum is mixed with the blood of another animal, the blood of this animal gives the thickest precipitate
(a) mule
(b) dog
(c) chimpanzee
(d) gibbon
Answer: (c)
4. In disputed parentage, blood group analysis of mother, alleged father and child can
(a) not be of any use
(b) only prove that he cannot be the father
(c) certainly prove a man to the father
(d) none of these
Answer: (b)
5. This is the genotype of blood group A
(a) IA IA|
(b) IA IO|
(c) IB IB|
(d) IA IA| or IA IO|
Answer: (d)
6. If a patient with blood group B requires an immediate blood transfusion, this type can be given
(a) AB and B
(b) AB and A
(c) AB and O
(d) B and O
Answer: (d)
7. In men, this is genetically dominant
(a) Albinism
(b) Haemophilia
(c) Rh positive
(d) color blindness
Answer: (c)
8. Color of the skin in humans is regulated by
(a) polygenic effect
(b) lethal genes
(c) multiple genes
(d) none of the above
Answer: (c)
9. The recessive character typically is expressed only when present in a double recessive condition. But, a single recessive gene can express itself in humans when genes are found on
(a) either on autosome or X chromosome
(b) X chromosome of male
(c) X chromosome of female
(d) any autosome
Answer: (b)
10. Two allelic genes are situated on
(a) any two chromosomes
(b) two non-homologous chromosomes
(c) two homologous chromosomes
(d) same chromosomes
Answer: (c)
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Related Links:
| MCQs On Blood groups |
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