Which of one of the following characteristics in man is controlled by a recessive gone?
Correct answer: D. Eye colour
- A. Tongue rolling
- B. Diabetes
- C. Skin colour
- D. Eye colour
Explanation
This mcq can only be solved by elimination trick. Tongue rolling is controlled by dominant trait while skin colour is a polygenic trait and exhibits intermediate phenotype due to co-dominance. This rules out option A and D. Diabetes is not usually linked with genetic factors and if it is even linked it is only autosomal dominant. This makes eye colour the best option in which blue eye colour is controlled by recessive gene.
This question appeared on the ETEA MDCAT 2008 paper, which you can sit online with every answer explained.
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About Mendel's Laws of Inheritance
Mendelian inheritance explains how alleles separate into gametes and assort during reproduction, producing predictable genotype and phenotype ratios. Questions cover dominance, recessiveness, homozygous and heterozygous conditions, the laws of segregation and independent assortment, monohybrid and dihybrid crosses, test crosses and the limits caused by linked genes.
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