Some people have hitchhiker's thumbs, which bend backwards with a large angle between the two segments (phalanges). The myth is that there are just two kinds of thumbs, straight thumbs (S) and hitchhiker's thumbs (H), and the trait is controlled by a single gene with two alleles, with the allele for S being dominant.This was proposed by Glass and Kistler (1953) and has been the subject of very little research since then.he myth is that there are just two kinds of thumbs, straight thumbs (S) and hitchhiker's thumbs (H), and the trait is controlled by a single gene with two alleles, with the allele for S being dominant. This was proposed by Glass and Kistler (1953) and has been the subject of very little research since then.
Two fundamental cellular processes are cellular respiration and photosyn-thesis. Cellular respiration is the process by which cells release stored energy from sugars. Photosynthesis is the process in which producer cells use carbon dioxide, water, and nutrients to produce glucose and oxygen.
Photosynthesis and cellular respiration are complementary reactions. Cellular respiration is the process by which most cells make energy. The products of photosynthesis, oxygen and glucose, are the reactants of the cellular respiration reaction.In turn, the products of cellular respiration, carbon dioxide and water, are the reactants in photosynthesis.ave. Flickr.com. Photosynthetic organisms use light energy from the sun to transform two reactants, carbon dioxide and water, into sugar and oxygen gas. Green plants, algae and some bacteria can perform photosynthesis and are responsible for oxygenating the Earth's atmosphere.