Question

In Drosophila, several alleles exhibit same phenotype, for eg. $W^{+s},W^{+c},W^{+g}$ exhibit eye colour, these alleles are called?

• A. Pseudoalleles
• B. Isoalleles
• C. Multiple alleles
• D. All of the above

Answer 1

The correct option is B Isoalleles

Isoalleles are the alleles present at the same loci and produce a similar phenotype. A special test is done to distinguish their phenotypes. If the governed phenotype is wild, they are referred as wild isoalleles while the isoalleles showing mutant phenotype are called as mutant isoalleles. Several alleles exhibit red eye colour in Drosophila and are said to be isoalleles.

Multiple alleles are the alternative forms of same gene present at same loci. The ABO blood group in human is governed by three alleles of gene "I" and hence is an example of multiple alleles.

PseudoalIeles are two or more closely linked genes which function as an allelic pair but structurally they are different genes and can sometimes undergo crossing-over and recombination.

So, the correct answer is option B.