Let’s say I determined that certain fruit-fly phenotype, a s…
Let’s say I determined that certain fruit-fly phenotype, a smaller abdomen, is due to being heterozygotic (Ss) for a gene responsible for serine metabolism. I cross the heterozygote with another heterozygote and 33% have a normal sized abdomen and 66% have a smaller abdomen. I even sequenced the offspring and determined that 33% were SS and 66% were Ss. What ratio of ss genotype should I expect, and what’s likely happening to them?