JAMB Biology 2007 Objective — Question 42

Question 42 of 50 from the Joint Admissions and Matriculation Board (JAMB) Biology 2007 Objective paper, with the correct answer and a full explanation.

Use the diagram below (a monohybrid cross showing dogs with a gene G for grey head, labelled I-IV) to answer questions 42 and 43. 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 gg is

A. I
B. II
C. III
D. IVCorrect

Explanation

Since G (grey head) is dominant over g, the dog lacking a grey head (recessive phenotype) is the one with the homozygous recessive genotype gg.

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