One form of male sterility (Ms) in corn is maternallytransmitted. Plants of a male sterile line crossed with normalpollen give male-sterile plants. In addition, some lines of cornare known to carry a dominant nuclear restorer allele(Rf-1) that restores pollen fertility in male sterilelines. Another dominant restorer (Rf-2) has been found on adifferent chromosome. Either or both of the restorer alleles willrestore pollen fertility in male sterile lines.
A male-sterile plant is crossed with pollen from a planthomozygous for Rf-1. An F1 plant from this cross is used as theovule donor, and crossed with pollen from a normal plant(rf-1/ rf-1). What phenotypes are produced bythis cross?
the ANSWER is fetile females; 1/2 fertile males; 1/2 sterilemales
I was just wondering if you could explain this answer?Thanks!
