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.
What are the roles plants play in an ecosystem? Photosynthensis, making food for animals and other organisms. They also provide us with nutrients, and take in the carbon dioxide and release oxygen for us to breathe.