Answer:
Biparental
Explanation:
Biparental inheritance refers to the transmission of genes from both the parents to progeny. The progeny obtains half of the genes from one parent and rest half from the other parent. For example, a human child obtains 23 chromosomes from mother and 23 chromosomes from father making a total of 46 chromosomes.
Mitochondrial inheritance is mostly maternal, that is, the progeny obtains mitochondrial genes from mother. According to the given information, the F1 plants exhibit mitochondrial genes from both the parents. This makes the mitochondrial inheritance in this plant a biparental one.