Answer:
Some mutations don't have any noticeable effect on the phenotype of an organism. This can happen in many situations: perhaps the mutation occurs in a stretch of DNA with no function, or perhaps the mutation occurs in a protein-coding region, but ends up not affecting the amino acid sequence of the protein.
The answer would be thermal insulator, hope it works goodluck
X^H X^H, because Irene does not have the recessive gene therefor her chromosomes are both dominate showing that she does not have the recessive trait