HD is called an autosomal dominant disorder because only one copy of the defective gene, inherited from one parent, is necessary to produce the disease. The genetic defect responsible for HD is a small sequence of DNA on chromosome 4 in which several base pairs are repeated many, many times.
Carbon dioxide cannot pass through the protective waxy layer covering the leaf (cuticle), but it can enter the leaf through an opening (the stoma; plural = stomata; Greek for hole) flanked by two guard cells. Likewise, oxygen produced during photosynthesis can only pass out of the leaf through the opened stomata.
Photosynthesis occurs in producers which makes food, energy and oxygen out of carbon dioxide, light and water. Respiration occurs can occur both in consumers and producers which is the reverse of photosynthesis which is the production of carbon dioxide from the reaction of sugar and oxygen. The sentence that is true among these is B. Comments.