Question

"both a kin selection theory and an alternative "fertile females" theory have been used to explain the transmission of genes that promote"

Answer 1

These theories have been used to explain the transmission of genes that promote homosexuality.
According to these theories, something happens to our genetic material when we are born or give birth to children which makes people experience attraction to the same sex. In fertile females theory, if there is a particular gene found on the x chromosome in men, they are likely to be gay; but if it's found in women, they will be more fertile than usual.