Answer:
Body colour and wing shape are linked genes
Explanation:
Suppose,
body color gene = A
wing shape gene = B
A test cross is being done between heterozygous but phenotypically wild type parrot ( AaBb ) and white parrot with deformed wings (aabb):
If the genes showed independent assortment, the ratio of progeny in this test cross would have been 1 : 1 : 1 : 1 i.e. all the different types of progeny would have been almost equal to each other in number
But according to the given data, the progeny is :
wild type : 720
white - deformed wings : 780
white - normal wings : 280
gray - deformed wings : 220
Hence, the number of offspring is not same in each category. Few combinations have higher number of parrots and others have lower number of parrots than expected value. This is a classic example of two linked genes where the parental type is produced in more numbers than the recombinant type.
