Question

Give the genotypes and phenotypes of the offspring of a backcross between the F1, and the red fruit colour homozygous

Answer 1

To obtain F1 gen, assuming R to be dominant and r to be recessive,

RR x rr → Rr 

Now for backcross, we have, 

Rr × RR → RR, Rr 

Genotype - 1:1 
Phenotype- 1