MCQs On Multiple Allelism

Multiple alleles occur when a gene has more than two allelic variants. Hereditary variances are caused by genetic variation, which emerges as a result of mutation. Three or more alleles of a gene are identified in this situation. The ABO blood group is the best example of this in humans.

1. An individual who has antigens A and B but no antibodies belongs to a blood group or has no antibodies to a blood group.

(a) O

(b) AB

(c) B

(d) A

Answer: (b).

The ABO blood group system is an example of inheritance.

2. When anti-human serum is combined with the blood of another animal in a serological test, the blood of this species produces the thickest precipitate.

(a) mule

(b) dog

(c) chimpanzee

(d) gibbon

Answer: (c).

3. Blood group analysis of the mother, purported father, and kid can be used in cases of contested parentage.

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).

4. This is the blood group A genotype.

(a) IA IA|

(b) IA IO|

(c) IB IB|

(d) IA IA| or IA IO|

Answer: (d).

5. This type of blood can be given to a patient with blood group B who requires an immediate blood transfusion.

(a) AB and B

(b) AB and A

(c) AB and O

(d) B and O

Answer: (d).

6. This is a genetically dominant trait in men.

(a) Albinism

(b) Haemophilia

(c) Rh positive

(d) colour blindness

Answer: (c).

7)In humans, the colour of the skin is controlled by 

(a) polygenic effect

(b) lethal genes

(c) multiple genes

(d) none of the above

Answer: (c).

8. When a twofold recessive condition is present, the recessive character is usually expressed. When genes are identified on

(a) either on autosome or X chromosome

(b) X chromosome of male

(c) X chromosome of female

(d) any autosome

Answer: (b).

9) however, a single recessive gene can express itself in humans. Two allelic genes are found on the same chromosome.

(a) any two chromosomes

(b) two non-homologous chromosomes

(c) two homologous chromosomes

(d) same chromosomes

Answer: (c).

10. At the hospital, a case was filed against the progeny being traded. To solve the case, the doctors used blood types. Parents’ blood group genotypes were IAi and IAIB. What was the blood group of the child who had been mistakenly identified as theirs?

a) A
b) B
c) AB
d) O

Answer: (d).
Explanation: These parents’ offspring may have IAIA, IAIB, IAi, or IBi. As a result, the progeny can have blood groups A, B, or AB. Only progeny with the O blood group will be able to be solved solely on the basis of blood groups.

11. The ABO system’s allele combinations result in six phenotypes.

a) True
b) False

Answer: (b).
Explanation: The ABO system has three alleles IA, IB, and i. The number of phenotypes produced by these alleles is only three.

12. The ABO system’s allele pairings result in six genotypes.

a) True
b) False

Answer: (a). Justification: Alleles IA, IB, and I make up the ABO blood system. These alleles can be combined to make up to six different combinations. This explains the six genotypes found.

13 What type of inheritance involves more than two gene forms producing a variety of phenotypes?

a) cells from an individual
b) organs from an individual
c) tissues from an individual
d) population

Answer: (d) is the answer.

Explanation: A person can only have two alleles at a time. As a result, sampling a huge portion of the population is required to study multiple allelism.

14)It is critical to research multiple alleles in order to discover them.

a) cells from an individual
b) organs from an individual
c) tissues from an individual
d) population

Answer: (d) is the answer.

Explanation: A person can only have two alleles at a time. As a result, sampling a huge portion of the population is required to study multiple allelism.

15)The inheritance mode is determined by

a) gene
b) genotype
c) phenotype
d) organism

Answer: (c).

Explanation: The phenotype determines the method of inheritance. A single gene can result in a variety of phenotypes, each of which has its own method of inheritance.

16)Which of the following is the only blood group that can be inherited from parents who have the genotypes IAIA and IBIB?

a) A
b) B
c) AB
d) O

Answer: (d). Explanation: The only allele that an IAIA parent can produce is IA. In the same way, the only allele that may be produced by an IBIB parent is IB. The alleles IA and IB will be present in the progeny. As a result, their blood type will be AB.

17)What will a person’s blood group be if their genotype is ii?

a) A
b) B
c) AB
d) O

Answer: (d).Explanation: When the genotype ii is present, the RBC does not express any sugar antigen. As a result, the progeny’s blood group is O.

18. If the blood group of an offspring is O, which of the following is not the correct parental genotype?

a) IAIA, IAIB
b) IAi, IAi
c) IAi, IBi
d) ii, ii

Answer: (a). Explanation: ii is the code for blood group O. As a result, only the IAIA, IAIB paternal couple can generate ii babies out of the available alternatives.

19. What is the progeny’s blood group if one parent donates the IA allele and the other contributes the I ?

a) A
b) B
c) AB
d) O

Answer: (a).Explanation: The progeny contains one copy of IA and one copy of i. IA has the upper hand over i. Only IA will be expressed as a result. This will give you the blood group A.

20. Which of the following statements is true if a gene has several alleles?

a) All the alleles same expressed at the same time
b) Among the multiple copies resent only the most dominant one is expressed
c) Only two alleles are present at a time
d) Only one allele is dominant rest all are recessive

Answer: (c). Explanation: When a gene contains numerous alleles, there are a variety of dominance recessive relationships, but an organism only has two of these multiple alleles, and the relationship between them determines the phenotype.