GENETICS QUESTIONS! HELP NEEDED

[corluk10]

1. In some breeds of dogs, a dominant allele controls the characteristic of barking while trailing. In these dogs the allele of another independent gene produces erect ears; it is dominantver the allele for drooping ears. Suppose a dog-breeder wants to produce a pure-breeding strain of droop-eared barkers, but he knows that the genes for silent trailing and erect ears are present in his kennels. How should he proceed?

2. Suppose that an allele, b, of a sex-linked gene is recessive and lethal. A man marries a woman who is heterozygous for this gene. If this couple had a large number of normal children, what would be the predicted sex ratio of these children.

OR if it helps...
it's Chapter 16 - Inheritance in "The Evaluation of Experimental Results"

[MrMistery]

well what have you come up with so far?