Question

Match the terms in Column I with their description in Column II and choose the correct option :
$\begin{array}{cccc}& ColumnI& & ColumnII\\ A.& Dominance& \left(i\right)& Manygenesgovernasinglecharacter\\ B.& Codominance& \left(ii\right)& Inaheterozygousorganismonlyonealleleexpressesitself\\ C.& Pleiotropy& \left(iii\right)& Inaheterozygousorganismbothallelesexpressthemselvesfully\\ D.& Polygenicinheritance& \left(iv\right)& Asinglegeneinfluencesmanycharacters\end{array}$

• A. (a) - (ii) (b) - (i) (c) - (iv) (d) - (iii)
• B. (a) - (ii) (b) - (iii) (c) - (iv) (d) - (i)
• C. (a) - (iv) (b) - (i) (c) - (ii) (d) - (iii)
• D. (a) - (iv) (b) - (iii) (c) - (i) (d) - (ii)

Answer 1

The correct option is B (a) - (ii) (b) - (iii) (c) - (iv) (d) - (i)

Dominance in genetics is a relationship between alleles of one gene, in which the effect on the phenotype of one allele masks the contribution of a second allele at the same locus. The first allele is dominant and the second allele is recessive.
Codominance is a form of dominance wherein the alleles of a gene pair in a heterozygote are fully expressed. This results in offspring with a phenotype that is neither dominant nor recessive.
Pleiotropy occurs when one gene influences two or more seemingly unrelated phenotypic traits.
Polygenic inheritance occurs when one character is controlled by two or more genes. Often the genes are large in quantity but small in effect. Examples of human polygenic inheritance are height, skin color, eye color and weight.