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In tomatoes, tall vines (T) are dominant to dwarf vines (t), and red fruit (R) is dominant to yellow fruit (r). A farmer mates a homozygous tall, red tomato plant (TTRR) with a heterozygous tall, red tomato plant (TtRr). What is the percent chance that the offspring will be dwarf plants with yellow fruit?
a. 25%
b. 0%
c. 100%
d. 50%

Respuesta :

Answer: b. zero percent

Histrionicus

In this case, the percent chance that the offspring will be dwarf plants with yellow fruit - b. 0%

It is given in this case that:

  • tall vines (T) - dominant
  • dwarf vines (t) - recessive
  • red fruit (R) - dominant
  • yellow fruit (r) - recessive

Cross between

  • purebred tall, red tomato plant (TTRR) x heterozygous tall, red tomato plant (TtRr)

Gametes:

  1. (TTRR) - TR
  2. (TtRr) - TR, Tr, tR, and tr

Punnet square:

                 TR        Tr         tR          tr

TR            TTRR    TTRr    TtRR     TtRr

We know that dwarf plants with yellow fruit would be - ttrr that is not produced in this cross.

Thus, In this case, the percent chance that the offspring will be dwarf plants with yellow fruit - b. 0%

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