Give the answer of following questions if in a test cross `AaBb xx aabb, 87.4%` of the progeny are like parents.
(i) Are the genes linked?
(ii) Is there any crossing over between the genes ?

Explanation

(i) As parental types are `87.4%` (or `gt 50%`) and non-parental types are `12.6%` ( or `lt 50%`), it means genes are linked.
(ii) Yes, Crossing over lead to recombination (generation of non-parental gene combinations).