PPT-Modification by descent (homologous structures)

When there is a similarity of the formation of a body part or organ due to a common evolutionary origin it is termed a homologous organ Biogeography D ifferent but closely related species in similar biomes across the world have similar features in adapting to that biome indicating that they probably developed from a common ancestral . This can be generalized to any dimension brPage 9br Example of 2D gradient pic of the MATLAB demo Illustration of the gradient in 2D Example of 2D gradient pic of the MATLAB demo Gradient descent works in 2D brPage 10br 10 Generalization to multiple Gradient descent is an iterative method that is given an initial point and follows the negative of the gradient in order to move the point toward a critical point which is hopefully the desired local minimum Again we are concerned with only local op Homologous and Analogous Structures. Need to Know. The difference between homologous and analogous structures and how this relates to evolution.. Convergent evolution. Concept 19.3: Evolution is supported by an overwhelming amount of scientific evidence. Homologous Structures (flowers). Broccoli and Cauliflower evolved from Mustard. print. Homology: A Bouquet of Broccoli One wouldn't normally munch on a rosebud or snap off a dandelion flower for a quick snack. But in fact, in terms of homologies, when you eat broccoli or cauliflower, you are doing just that. Although not scented or suitable for centerpieces, the green tips of broccoli and the white tips of cauliflower are actually flowers. Through many generations of artificial selection, farmers modified the bright yellow blooms of the wild mustard plant into the edible, vegetal plant parts you'll find nestled next to the ranch dip on the hors d'oeuvre tray. . Erica, . Nao. , Christian and Justine. What are Homologous Structures? . Structures derived . from a common . ancestor or . same . evolutionary or . developmental . origin. May not perform . the same function but they share a common ancestral origin. . Comparative Morphology. Analogous Structures. Structures with similar . function. but different internal structure, development (bird wing and insect wings, dolphin fin and shark fin). Does . NOT . show evolutionary relationships. nd. , 2014 . Give one example of an adaptation and explain . why. it is an adaptation. . Define evolution by natural selection.. 3. Give an example of geographic isolation. . 4. How are convergent and divergent evolution different? . Lecture 65 – Lecture 66. Evidence of Evolution. Ozgur. . Unal. 1. Support for Evolution. 2. The. theory of evolution states that all organisms on Earth have descended from a common ancestor.. The theory explains the existing data and suggests further areas for experimentation.. Derived traits. are newly evolved features, such as feathers, that do not appear in the fossils of common ancestors. .. Ancestral traits. are more primitive features, such as teeth and tails, that do appear in ancestral forms.. A Darwinian View of Life. As the 19th century dawned, it was generally believed that species had remained unchanged since their creation. However, a few doubts about the permanence of species were beginning to arise. A hypothetical trace of evolution. One original common ancestor. Scientists use both morphology and genetics to produce phylogenic trees. Morphology- share similar physical characteristics. Analysis of genetic similarity. (5) . Webquest. Comparative anatomy. provides . evidence of evolution . because it shows that various organisms share a common ancestor.. http://. cyemae.wordpress.com. /evolution-of-man/. H. omologous structures. Fossil evidence for evolution. Most evidence of evolution was originally found in fossils. Fossils can preserve the structure of organisms in sedimentary rock if conditions are just right. . One area of evidence of evolution is embryology, the study of embryos. When we compare embryos we can see shared characteristics of organisms throughout their developmental process. . Homologous structures. Human Arm . Bat Wing . Whale Flipper. . Analogous. Structures . Similar functions but NOT structurally related. . Insects are arthropods and birds are vertebrates. . The wing of a bird and the wing of a butterfly are examples of .