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.
People with achondroplasia sometimes have children together. If so, each parent has a 50:50 chance of passing on the gene. Thus, with each conception, there is a 25% chance for an average-size child, a 50% chance for a child (like them) with achondroplasia and a 25% chance for a conception with two achondroplasia genes.