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.
Below are things that plants make by photosynthesis: Glucose Oxygen (light energy is shown in brackets because it is not a substance) NOTES Plants get CO2 from the air through their leaves, and water from the ground through their roots. Light energy comes from the sun. The oxygen produced is released into the air from the leaves.