Question

A cross was done between dominant wild type grey bodied male drosophila melanogaster having developed wing, with recessive mutant yellow bodied female fly having vestigial wing. $F_1$ offsprings of the above cross were as follows-

(a) All females were of wild type variety with grey body and developed wing

(b) All males were of mutant type with yellow body and vestigial wing

Based on information given above, identify the genotype of parental generation form options given below-

• A.
  
• B.
  
• C.
  
• D.
  

Answer 1

The correct option is B


Drosophila of typical appearance are said to show the “wild-type” forms (phenotypes) of genetically-controlled traits for body colour, eye colour, wing shape, etc. Naturally occurring or artificially-induced genetic variants (mutations) of the alleles that control these traits produce flies with different morphologies, according to the dominant or recessive nature of the alleles involved in the genotype. Such mutant alleles are designated by symbols that are typically abbreviations of the mutant name

Body colour (X linked character) -Dominant - Grey

Recessive - Yellow

Wings-Dominant-Developed wings

Recessive -Vestigial wings

Male—Grey body male Develop wings

Female—Yellow body Vestigial wings

According to question both genes are linked.

So,the correct answer is "option B"