In a given species of fly, straight wing (s+) is dominant to curled wing (s) and red eye (r+) is dominant to brown eye(r). A cross between genotypes r + rs + s and rrss given the following results :
$25$ % red eyed, straight wings $25$ % brown eyed, straight wings
$25$ % red eyed, curled wings $25$ % brown eyed, curled wings
These results illustrate

independent assortment

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linkage

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crossing over

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codominance

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Solution

The correct option is A independent assortment
gametes r+s+ r+s rs+ rs
rs r+rs+s- Red-eye straight wings r+rss: Red-eye curled wings rrs+s: brown eyes straight wings rrss: brown eyes curled wings
If the independent assortment exists then the cross between r+rs+s x rrss gives the following results:
1:1:1:1:: Red-eye straight wings: Red-eye curled wings: Brown eyes straight wings: brown eyes curled wings
the results after cross are same in punnet square as well as in the experiment performed. Thus it is inferred that the genes are inherited independently of each other.
So, the correct answer is 'Independent assortment'.

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gametes	r+s+	r+s	rs+	rs
rs	r+rs+s- Red-eye straight wings	r+rss: Red-eye curled wings	rrs+s: brown eyes straight wings	rrss: brown eyes curled wings