Question

In Drosophila, several alleles exhibit the same phenotype, for eg. W+s, W+c, W+g exhibit eye color, are these alleles called?
(A)Pseudoalleles
(B)Isoalleles
(C)Multiple alleles
(D)All of the above

Answer 1

Hint: When several alleles exhibit the same phenotype, for eg. W+s, W+c, W+g exhibit eye color, these alleles are found to be present on the same loci of the chromosome and can be distinguished only by performing special tests.

Complete answer:
The allele whose phenotype is indistinguishable is known as Isoalleles. They have very minor differences in their activity. Isoalleles are also of two types. If the phenotype is wild, it is known as wild is an allele, and if the phenotype i9s mutant, it is known as a mutant isoallele. In the wild type, an individual persists the normal phenotype; that's, the phenotype generally found during a natural population of organisms. In the mutant type, an individual has a phenotype that differs from the traditional phenotype.

Additional Information:
Multiple alleles is a condition in which more than two alternative forms of a gene are located at the same loci. When present together they exhibit codominance. The example of multiple alleles in humans is seen in blood groups. ABO blood group is a type of multiple alleles. Individuals with AB blood group have allele A and B both present and they act as a co-dominant.
Pseudoallelism is a state within which two genes with similar functions are located so near to each other on a chromosome that they're genetically linked. This suggests that the 2 genes (pseudoalleles) are nearly always inherited together.
So, the correct answer is ‘Isoalleles’.

Note: The fruit fly has a red-brown eye color caused by the presence of two classes of pigments, which are pteridines (red) and ommochromes (brown). There are independent pathways for the synthesis of each pigment.