(i) Control crosses are not possible in case of humans beings.
(ii) Analysis of traits in several generations of family /To trace pattern of inheritance / whether the trait is dominant or recessive / *** linked or not.
Detailed Answer:
(i) This is because control crosses are not possible in case of humanc beings.
(ii) (a) Traits can be analysed for several generations.
(b) Pattern of inheritance can be traced.
(c) To trace whether the trait is dominant or recessive or *** linked or not.
