Biology · Genetics

An embryo lethal recessive mutation in a plant gene 'R' located on chromosome 1 was rescued by an ectopically integrated GFP-tagged wild type 'R' transgene (R-comp) which is inserted in chromosome 4. When a female homozygous R-comp plant is crossed to a male purple-col oured recessive mutant, some of the resultant F1 embryos showed chromosome segregation defects. The plants regenerated from these embryos were purple and sterile, and found to contain the wild type gene 'R' but not the R-comp transgene. What is the ploidy of the above F1 plants?