Name:______________________________________________ Objective: Simulate changes in moth population due to pollution and predation, and observe how species can change over time. Introduction: Charles Darwin accumulated a tremendous collection of facts to support the theory of evolution by natural selection. The economic changes known as the industrial revolution began in the middle of the eighteenth century. Instructions: Click the link below to read more information on Kettlewell's study of moths. After 5 minutes record the % of dark moths and light moths - you will need this information later. Peppered Moth Simulation at peppermoths.weebly.com Data and Analysis Read the background information and answer the questions as you go. Life Cycle of the Peppered Moth 1. 2. 3. 4. 5. 6. Impact of Pollution 7. 8. 9. 10. 11. 12. Kettlewell's Experiments 13. 14. 15. 16. 17. 18. 19. 20. Birdseye View 21. Final Analysis 22. 23. 24.
• UNIT 2 - Biological Unity & Diversity
Before DNA, before RNA: Life in the hodge-podge world - life - 08 January 2012Take note, DNA and RNA: it's not all about you. Life on Earth may have begun with a splash of TNA – a different kind of genetic material altogether. Because RNA can do many things at once, those studying the origins of life have long thought that it was the first genetic material. But the discovery that a chemical relative called TNA can perform one of RNA's defining functions calls this into question. Instead, the very first forms of life may have used a mix of genetic materials. Today, most life bar some viruses uses DNA to store information, and RNA to execute the instructions encoded by that DNA. A key piece of evidence for this "RNA world" hypothesis is that RNA is a jack of all trades. Now it seems TNA might have been just as capable, although it is not found in nature today. It differs from RNA and DNA in its sugar backbone: TNA uses threose where RNA uses ribose and DNA deoxyribose. The team took a library of TNAs and evolved them in the presence of a protein. No TNA world
DNA . GeneticsIn the 150 years since Mendel's first experiments, geneticists have discovered that genetic traits usually don't follow simple inheritance patterns. Some traits, like human eye color and stature, are produced by the interplay of many sets of genes; these are known as "polygenic traits." Other traits show a phenomenon called intermediate expression, in which a heterozygous genotype will produce a phenotype that's different from homozygous dominant genotypes. In addition, some genes have more than two different versions. Now that you know a little about blood types, let's learn about the genes that code for them.The Perfect Beak NGSSTo begin the lesson, have students complete the anticipation guide about natural selection, in order to gauge the students’ prior knowledge. Review the guide together as a class, making note of misconceptions that students hold; you will want to tweak this lesson in order to address the specific needs of your students. Let students know that we will be exploring these concepts in a few simulation activities. Ask students if we all have the same color hair? Discuss with students whether the trait to roll our tongue or the trait for our attached or detached earlobes affects our survival. Photo taken from Preparation for Activity Part 1: Activity Part 1: Introduction & Preparation: Tell students that they will participate in a simulation that will help answer the question: How might a genetic trait affect an organism’s chance of survival? Activity & Recording Data: Interpreting & Analyzing Data: Activity Part 2: Writing Activity
KidWingsThe driving force for molecular evolution of translationBritish scientists recreate the molecules that gave birth to life itselfBy Nick Enoch Updated: 08:03 GMT, 27 January 2012 Organic chemists at the University of York have recreated a pair of simple sugars - threose and erythrose - in a process which could have occurred before the advent of life Scientists are one step closer to understanding the origin of life after making a breakthrough into how sugar molecules found in DNA are created. Organic chemists at the University of York have recreated a pair of simple sugars - threose and erythrose - in a process which could have occurred before the advent of life. The team, led by Dr Paul Clarke, along with colleagues at the University of Nottingham, have made the first step towards showing how the basic building blocks of life developed. Every biological molecule has an ability to exist in a left-handed form or right-handed form. All sugars in biology are made up of the right-handed form of molecules and yet all the amino acids that make up the peptides and proteins are made up of the left-handed form.
Genetic DisordersBetterLesson - Natural Selection - Survival of the FittestIn this section of lesson students read an article on Natural Selection from cK-12. 1. Inherited vs Acquired Traits 2. To check for understanding, students answer the following questions at end of video: What's the difference between an acquired and inherited trait? In addition to reading, I show students Evolution in 1 Minute video that does a good job at visually summarizing the process of natural selection. Link It's important to point out to student that genetic variation, along with environment conditions, produces the conditions for natural selection. In addition, it's crucial to communicate the fact that natural selection is not an active process, meaning nature is not intentionally selecting one set of individuals over others.
NOVA scienceNOW | Watch OnlinePlease sign in using one of our supported services to begin saving your favorite programs and videos. We have updated our registration process. Please sign in using one of our supported services to bookmark your favorite programs and videos. If you have a PBS account, your stored favorites and viewing history will be safely migrated. By signing in, you are authorizing PBS to share your email address with your local PBS station to send you periodic communications about station events, services and support. Warning: Data migration for current PBS account holders is a one time only event.