A) mitochondria
B) cytoplasm
C) nucleus
D) chloroplast
Correct Answer: A
Solution :
The progenies type of male sterility is determined by the cytoplasm. Since the cytoplasm of a zygote comes primarily from egg-cell, the progeny of such sterile plants would always be male sterile. Cytoplasmic male sterility is known in many plant species, some of which are crop plants. Cytoplasmic male sterility may be transferred easily to a given strain by using that strain as a pollinator (recurrent parent) in the successive generation of a backcross programme. After 6-7 backcrosses, the nuclear genotype of male sterile line is maintained by crossing it with the pollinator strain used as the recurrent parent in the backcross programme since the nuclear genotype of the pollinator is identical with that of the new male sterile line. There is evidences that the gene for Cytoplasmic male sterility particularly in maize reside in mitochondria.
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