Inheritance MCQs for MDCAT Practice

Biology section, Inheritance chapter. Sample questions from past PMC papers.

1. Question 1
   In the study of heredity, scientists examine how traits are passed from parents to offspring. This area of biology considers patterns of inheritance and how genetic information is transmitted across generations. Early research in this field involved the use of model organisms to track the appearance of observable traits. By analyzing these patterns, researchers began to develop principles that explain how traits can appear in some generations but not others. Today, these principles continue to inform modern genetics and our understanding of inheritance in both plants and animals. Which of the following best describes a genotype?
   • A.The observable characteristics of an organism
   • B.The environment's influence on a trait
   • C.The evolutionary origin of a gene
   • D.The specific allele combination an organism carries
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2. Question 2
   Child death may occur in the marriage of:
   • A.Rh+ man and Rh+ woman
   • B.Rh+ man and Rh– woman
   • C.Rh– man and Rh– woman
   • D.Rh– man and Rh+ woman
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3. Question 3
   ABO blood grouping is controlled by gene I which has three alleles and show co-dominance. There are six genotypes. How many phenotypes in all are possible?
   • A.Six
   • B.Four
   • C.Three
   • D.Five
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4. Question 4
   Which group of animals has heterogametic females?
   • A.Domestic fowl
   • B.Earthworm
   • C.Rabbit
   • D.None of these
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5. Question 5
   One of the parents of a cross has a mutation in its mitochondria. In that cross, that parent is taken as a male. During segregation of F2 progenies that mutation is found in:
   • A.One-third of the progenies
   • B.None of the progenies
   • C.All the progenies
   • D.Fifty percent of the progenies
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6. Question 6
   The process of determining the locus for particular biological traits includes?
   • A.Replication
   • B.Recombination
   • C.Gene mapping
   • D.None of these options is correct
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7. Question 7
   A haemophilic male marries a haemophilia B carrier female have 4 children. 1 of their children is haemophilic and the remaining 3 are normal. What is the probability that their next child will be haemophilic?
   • A.25%
   • B.50%
   • C.75%
   • D.100%
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8. Question 8
   Inheritance of 4’O clock plant exhibits:
   • A.Complete dominance
   • B.Incomplete dominance
   • C.Codominance
   • D.Over-dominance
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