PPT-Homologous Structures

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 . Featured . plant genetics topic . of local and timely interest: . The 2014 GMO . Ballot Measure. Focusing . on a plant: Roundup Ready sugar beets . in the Willamette Valley. http://www.nwfoodnews.com/2011/02/18/meet-the-sugar-beet/. IMSS . BIOLOGY . . ~. . . SUMMER . 2011. LEARNING TARGETS. To understand that biological evolution . involves . descent with modification. . To explain and give different types of evidence for the key concept of biological evolution: all life shares a common ancestor.. Meiosis . MEIOSIS. The production of offspring by sexual reproduction includes the fusion of two gametes, each with a complete haploid set of chromosomes. . Gametes are formed from specialised diploid cells. This specialised kind of cell division that reduces the chromosome number by half results in the production of haploid daughter cells. This kind of division is called . Evolution Videos. How Evolution Works. http://www.youtube.com/watch?v=hOfRN0KihOU. What is Evolution?. http://www.youtube.com/watch?v=GhHOjC4oxh8. What is Natural Selection?. http://www.youtube.com/watch?v=0SCjhI86grU. Meiosis and genetic diversity. Learning Goal:. Understand how meiosis contributes to genetic diversity. Group 5 - Team . Phoenix. !. UMBC. . Stephen Miller . Michelle Starz-Gaiano. Wellesley College. Bat wing. Mole foot. Analogous structures. are . not. evidence of a common ancestor.. Analogous structures. have different structures but a similar function.. Analogous structures. Analogous structures=evidence of convergent evolution. Alleles segregate during meiosis allowing new combinations to be formed by the fusion of gametes. . Understandings:. One diploid nucleus divides by meiosis to produce four haploid nuclei. . The halving of the chromosome number allows a sexual life cycle with fusion of gametes. . 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? . Organism DNA. 1a. Some of the strongest evidence for evolutionary relationships comes from studying the DNA of different organisms.. 1b. The fact that all organisms use the same DNA molecule to code for genetic information suggests that these organisms share a distant ancestor.. 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.. Key Concepts:. What happens during the process of meiosis?. How is meiosis different from mitosis?. Types of . Reproduction. Section 11-4. ASEXUAL. SEXUAL. 1. One Parent. 2. Binary fission (in prokaryotes) or mitosis in (eukaryotes).. is the process of change over time.. Evidence of evolution. . Biogeography. is the study of where organisms live now and where their ancestors lived in the past.. Patterns in the distribution of living and fossil species tell us how modern organisms evolved from their ancestors.. Evidence. Evidence. . of . common ancestry . among species comes from many sources.. . 2. FIVE PIECES OF EVIDENCE FOR EVOLUTION. G – Geographical . distribution . F – Fossil . evidence (remains of ancient organisms). 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 .