Question

regulatory genes
regulatory genes ______ the expression of other genes.
a regulatory gene may ______ another gene from expressing its dominant trait.
the manx cat has no tail because it has a regulatory gene that silences the tail gene. the tail silencing gene is dominant.
s-silences tail gene–no tail (manx cat)
s-does not silence tail gene–has tail (non-manx cat)

Explanation:

Regulatory genes control the expression of other genes. A regulatory gene can silence the expression of a structural gene (like the tail gene in cats), and a dominant regulatory trait will be expressed. The Manx cat's tailless trait is a result of a dominant regulatory gene that silences the tail gene.

Answer:

1. Regulatory genes control the expression of other genes.
2. A regulatory gene may silence another gene from expressing its dominant trait.
3. S—Silences tail gene—no tail (Manx cat)