When red tall plant is crossed with dwarf white plant all the plants of F, are found to be tall red. which of the following ratio will be available when a test cross is made_________________?
Correct answer: C. 1:1:1:1
- A. 3:1
- B. 1:2:3
- C. 1:1:1:1
- D. 1:2:1
Explanation
The all-tall, all-red F1 indicates that tall and red are dominant and that the F1 is heterozygous for both traits. A dihybrid testcross with the double-recessive parent produces four classes in a 1:1:1:1 ratio.
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