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In a certain variety of lentils, one gene controls color: red is completely dominant to orange, while a second independent gene controls pattern: large spots are co-dominant with small dots. A dihybrid cross involving these two genes should result in:

Respuesta :

marianaegarciaperedo

Answer:

a phenotypic ratio 9:3:3:1  

Explanation:

  • one gene controls color: red (R) is completely dominant to orange (r)
  • a second independent gene controls pattern: large spots (L) are co-dominant with small dots (l)
  • A dihybrid cross involving these two genes

Cross:

Parental) RrLl   x   RrLl

Gametes) RL  Rl  rL  rl

                RL  Rl  rL  rl

Punnet Square)   RL         Rl         rL        rl

                RL     RRLL     RRLl    RrLL    RrLl

                Rl      RRLl      RRll      RrLL    Rrll

                rL      RrLL      RrLl      rrLL     rrLl

                rl       RrLl       Rrll        rrLl      rrll

F1) 9/16 R-L-, red and large spotted individuals

     3/16 R-ll, red and small dotted individuals

     3/16 rrL-, orange and large spotted individuals

    1/16 rrll, orange and small dotted individuals      

Note: The symbol "-" refers to either the dominant allele or the recessive one

     

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