JAMB Biology 2008 Objective — Question 42

Question 42 of 50 from the Joint Admissions and Matriculation Board (JAMB) Biology 2008 Objective paper, with the correct answer and a full explanation.

Use the diagram below to answer questions 42 and 43 (dogs I-IV). If the dogs are offspring of a monohybrid cross and the gene G for grey head is dominant over its allele e.g. the individual whose genotype is likely to be egg is

A. ICorrect
B. II
C. III
D. IV

Explanation

For a monohybrid cross where G (grey head) is dominant, the individual with the recessive phenotype (no grey head) most likely has the homozygous recessive genotype, corresponding to option A.

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