One form of male sterility (Ms) in corn is maternally transmitted. Plants of a m

Question

One form of male sterility (Ms) in corn is maternally transmitted. Plants of a male sterile line crossed with normal pollen gives male- sterile plans. In addition, some lines of corn are known to carry a dominant nuclear restorer allele (Rf-1) that restores pollen fertility in male sterile lines. Another dominant restorer (Rf-2) has been found on a different chromosome. Either or both of the restorer alleles will restore pollen fertility in male sterile lines.

If a male-sterile plant is crossed with pollen from a plant homozygous for Rf-1, what is the phenotype of the F1

fertile females; sterile males

sterile females; fertile males

1/2 fertile females; 1/2 sterile females; 1/2 sterile males; 1/2 fertile males

fertile females; fertile males

sterile females; sterile males

the ANSWER is fertile females: fertile males, I was wondering if there was any way you could explain? Thanks!

fertile females; sterile males

sterile females; fertile males

1/2 fertile females; 1/2 sterile females; 1/2 sterile males; 1/2 fertile males

fertile females; fertile males

sterile females; sterile males

Explanation / Answer

Thge male sterility gene (MS) in corn trasmits maternally. This means, male offspring inherit the trait from female parent. The nuclear restorer allele (Rf-1) restores fertility in males. Thus, a cross between male-sterile plant with pollen from a plant homozygous for Rf-1 results in fertile females. The male offspring produced though inherited the sterility gene, the Rf-1 from other parent reversed the condition. This means sterile maes become fertile males. Therefore, the F1 offspring produced from this cross are fertile females and fertile males.

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