A teacher prepared a dihybrid cross Punnett square and a key to dominant and recessive traits. According to the information shown above, what is the appearance of offspring X?

0 Tall, round

Short, wrinkled

O Short, round

O Tall, wrinkled

Answer and Explanation:

There are four phenotypes: tall, short, round, wrinkled

Let us say that for the high trait, tall dominates over short. For the shape trait, round dominates over wrinkled. This is:

The fact that parental are dihybrid, tells us that their genotypes were TtRr

Cross:

Parental)        TtRr          x         TtRr

Gametes) TR tR Tr tr           TR tR Tr tr

Punnet Square)     TR           tR           Tr          tr

                  TR      TTRR     TtRR     TTRr       TtRr

                   tR      TtRR      ttRR       TtRr        ttRr

                   Tr      TTRr      TtRr       TTrr         Ttrr

                   tr       TtRr       ttRr        Ttrr           ttrr

F1)         Genotype    and    Phenotype

Phenotypic proportions  

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