When a pea plant with round seeds was crossed with one with wrinkled seeds, 48 plants producing round seeds and 39 producing wrinkled seeds were obtained. Based on the ratio of the offspring obtained predict the genotype of the parents and the offspring. Why such a cross done. Represent the cross with appropriate symbols.

Dear student
Please find below the solution to the asked query
 

The ratio of round seeded and wrinkled seeded plants is nearly equal i.e 1:1. Hence the possible genotype of parents will be 

Rr (round seeded) and rr (wrinkled seeded) and for offsprings will be also same i.e Rr and rr.

The cross represents a test cross and is done to know genotype of unknown parents.

The cross can be repreented as

Parents                Rr            x             rr

Gametes               R, r                       r, r

Offsprings                      Rr  and   rr


Hope this information will clear your doubts about the topic.
Regard