Ichthyosis hystrix gravior is a disease characterized by thickened, rough, horn-like skin. It is always transmitted by a father to all of his sons, but never occurs in women. a) Use CER (claim, evidence, reasoning) to write a conclusion about this disease. (Hint: start by formulating a question, create a chart representing the genotypes and phenotypes of a normal male and female and of a male with the disease, insert the possible genotypes into Punnett squares to show your evidence.)