Non-Mendelian Genetics Practice Test

In a fish species, scale color shows codominance. Allele G produces green scales and allele S produces silver scales. Heterozygotes (GS) have both green and silver scales visible. Two heterozygous fish are crossed (GS × GS). Which outcome best predicts the phenotypes among their offspring?

A human blood type gene has three alleles: $I^A$, $I^B$, and $i$. Alleles $I^A$ and $I^B$ are codominant, and both are dominant to $i$. A person with type AB blood ($I^AI^B$) has a child with a person with type O blood ($ii$). Which set of possible child blood types is expected?