Some protists are colony forming. hypothesize why this may be an advantage or disadvantage.

One of the arguments in regard to the colony forming versus solitary development would be the Darwin's theory of evolution. This is more of an advantage than disadvantage as there is a higher success in the evolutionary process for a colony forming based protist then.

This post might have the info you need:

Since a female is both xx chromosome and the male passes down the x chromosome, than the offspring would be female since a female is xx.