Single Choice

Match column I with column II and select the correct option from the given codes. Column I Column II A. Multiple alleles (i) Phenylketonuria in Humans B. Polygenes (Multiple genes) (ii) Blood groups in humans C. Pleiotropic (iii) Skin color in humans

AA-(ii), B-(i), C-(iii)
BA-(ii), B-(iii), C-(i)
Correct Answer
CA-(iii), B-(ii), C-(i)
DA-(i), B-(iii), C-(ii)

Solution

Pleiotropy occurs when one gene will code and control the phenotype or expression of several different and unrelated traits. For example, phenylketonuria is an inherited disorder that affects the level of phenylalanine in the human body. and is caused by pleiotropy. Multiple alleles are three or more alternative forms of a gene (alleles) that can occupy the same locus.For example, the ABO system of blood groups is controlled by three alleles, only two of which are present in an individual. Polygenic inheritance refers to the kind of inheritance in which the trait is produced from the cumulative effects of many genes in contrast to monogenic inheritance wherein the trait results from the expression of one gene (or one gene pair). Human skin color is a good example of polygenic (multiple gene) inheritance. .
So, the correct option is 'A-(ii), B-(iii), C-(i)'.

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