Answer:
1. 100%
2. 0%
3. impossible
All their offspring will have brown eyes because they will all inherit the <u>dominant </u>allele for brown eyes. They will all inherit the allele for blue eyes but since this is recessive they will now show it.
A shield vol may be produced by hot spots which lay far away from the edges of tectonic plates. Shields also occur along the mid-oceanic ridge, where sea-floor spreading is in progress and along subduction related volcanic arcs.
Traits that have 3 or more phenotypes may be the result of MULTIPLE alleles, I believe. Hope that helps!