Match LIST I with LIST II: 

Choose the correct ansssion V. Greenwer from the options given below:

A-V, B-IV, C-I, D-II

The correct answer is Option (4) -A-V, B-IV, C-I, D-II

A. Dominant trait of pod colour in garden pea is green and recessive trait is yellow.

B. Morgan and his group knew that the genes were located on the X chromosome and saw quickly that when the two genes in a dihybrid cross were situated on the same chromosome, the proportion of parental gene combinations were much higher than the non-parental type. Morgan attributed this due to the physical association or linkage of the two genes and coined the term linkage to describe this physical association of genes on a chromosome and the term recombination to describe the generation of non-parental gene combinations .

C. Traits that are generally controlled by three or more genes and are thus called as polygenic traits. Human skin colour is another classic example for this. In a polygenic trait the phenotype reflects the contribution of each allele, i.e., the effect of each allele is additive.

D. When a single gene controls several phenotypic expressions, it is called a pleiotropic gene. An example of this is the disease phenylketonuria, which occurs in humans. The disease is caused by mutation in the gene that codes for the enzyme phenyl alanine hydroxylase (single gene mutation). This manifests itself through phenotypic expression characterised by mental retardation and a reduction in hair and skin pigmentation.