Which of the following statements are true about Mendel's observations? Pick any or all that apply. In crosses involving one true-breeding strain with a dominant allele and a second true-breeding strain with a recessive allele, the dominant trait was observed in all F1 progeny and 75% of F2 (F1 X F1) progeny He discovered that the allele from one locus that assorts into gametes depends entirely on which allele at a second locus assorted into the same gamete All of the traits he studied showed dominance of one allele over a second allele He hypothesized that each parent carries two factors for each single character and that offspring received only one factor for that single character from a given parent