The skin's dermis is made of layers of cells, connective tissue and several structures that aid in maintaining its function. These structures include blood vessels, hair follicles, lymph vessels and glands.
XnY one color blind boy. 1  Probability of having a color blind daughter is (1/2 x 1/2) or 1/4 or 25% (0.25) This is because both sex and colorblindness are involved in the solution.  The probability that their first son is color blind is 50% (0.50). In this question only males are part of the solution.
Colorectal cancer risk factors. GENERAL. 1  Age: Although colorectal cancer can occur at any age, the chances of developing the disease dramatically increase after the age of 50.  Racial and ethnic background: African Americans have the highest incidence of this disease in the United States.