I am doing Hygromycin selection of T1 seeds of Transformed Rice Plants (35S-intrest gene). I grew 60 seeds in 50 mg/L of Hygromycin selection media and after one week, I observed very clear 3:1 segregation ratio and 25% of seedlings clearly stopped growing. I also observed among 75 %, some plants grow very fast and healthy but some grow in normal speed. Therefore, I was wondering if homozygote lines grow much better compared to heterozygote lines.