Kype Kype A kype is a hook-like secondary sex characteristic which develops at the distal tip of the lower jaw in some male salmonids prior to the spawning season. The structure usually develops in the weeks prior to, and during, migration to the spawning grounds. In addition to the development of the kype, a large depression forms in the two halves of the premaxilla in the upper jaw, allowing the kype to fit into the premaxilla when the mouth is closed. The kype functions as a secondary sexual characteristic and influences the formation of dominance hierarchies at the spawning grounds. The
The Different Forms of Flowers on Plants of the Same Species The Different Forms of Flowers on Plants of the Same Species The Different Forms of Flowers on Plants of the Same Species is a book by Charles Darwin first published in 1877. It is the fifth of his six books devoted solely to the study of plants (excluding "The Variation of Animals and Plants under Domestication"). These writings contributed to Darwin's pursuit of evidence that would support his theory of natural selection. There were only two more books to follow: "The Power of Movement in Plants" (1880) and "The Formation of Vegetable Mould through the Action of Worms" (1881). He