background preloader

Biology - Science

Biology - Science
Related:  biology

Ask Nature - the Biomimicry Design Portal: biomimetics, architecture, biology, innovation inspired by nature, industrial design - Ask Nature - the Biomimicry Design Portal: biomimetics, architecture, biology, innovation inspired by nature, industrial desi Genetics Practice Problems Genetics Practice Problems You may type in your own answers, then check to see if you were right. If you’re totally stumped, you can tell the computer to show you the answer to a particular question. Monohybrid Cross: In humans, brown eyes (B) are dominant over blue (b)*. (* Actually, the situation is complicated by the fact that there is more than one gene involved in eye color, but for this example, we’ll consider only this one gene.) Testcross: In dogs, there is an hereditary deafness caused by a recessive gene, “d.” Incomplete Dominance: Note: at least one textbook I’ve seen also uses this as an example of pleiotropy (one gene – multiple effects), though to my mind, the malaria part of this is not a direct “effect” of the gene. In humans, there is a gene that controls formation of hemoglobin, the protein in the red blood cells which carries oxygen to the body tissue. A photo, taken by Dr. Dihybrid Cross: If the man is both Rr and Tt (How do we know that?) Multiple Alleles and Codominance:

Cell Size and Scale Some cells are visible to the unaided eye The smallest objects that the unaided human eye can see are about 0.1 mm long. That means that under the right conditions, you might be able to see an ameoba proteus, a human egg, and a paramecium without using magnification. Smaller cells are easily visible under a light microscope. To see anything smaller than 500 nm, you will need an electron microscope. Adenine The label on the nucleotide is not quite accurate. How can an X chromosome be nearly as big as the head of the sperm cell? No, this isn't a mistake. The X chromosome is shown here in a condensed state, as it would appear in a cell that's going through mitosis. A chromosome is made up of genetic material (one long piece of DNA) wrapped around structural support proteins (histones). Carbon The size of the carbon atom is based on its van der Waals radius.

Mendelian inheritance Gregor Mendel, the German-speaking Augustinian monk who founded the modern science of genetics. Mendelian inheritance was initially derived from the work of Gregor Johann Mendel published in 1865 and 1866 which was re-discovered in 1900. It was initially very controversial. History[edit] The laws of inheritance were derived by Gregor Mendel, a nineteenth-century Austrian monk conducting hybridization experiments in garden peas (Pisum sativum).[1] Between 1856 and 1863, he cultivated and tested some 5,000 pea plants. Mendel's conclusions were largely ignored. Mendel's findings allowed other scientists to predict the expression of traits on the basis of mathematical probabilities. Mendel's laws[edit] Mendel discovered that when crossing purebred white flower and purple flower plants, the result is not a blend. Mendel summarized his findings in three laws: the Law of Segregation, the Law of Independent Assortment, and the Law of Dominance. Law of Segregation (The "First Law")[edit] Notes[edit] Heredity - Genes and Alleles As of July 1, 2013 ThinkQuest has been discontinued. We would like to thank everyone for being a part of the ThinkQuest global community: Students - For your limitless creativity and innovation, which inspires us all. Teachers - For your passion in guiding students on their quest. Partners - For your unwavering support and evangelism. Parents - For supporting the use of technology not only as an instrument of learning, but as a means of creating knowledge. We encourage everyone to continue to “Think, Create and Collaborate,” unleashing the power of technology to teach, share, and inspire. Best wishes, The Oracle Education Foundation

Learn Biology Online For Free with our Huge Collection of Open Courses If you’ve always been interested to learn more about nature and the diversity of life, you can now Learn Biology Online for Free! Free Biology courses are easy to find yet some of the ones you find may not be worth your time. We’ve put together a list of Biology courses from well-respected institutions such as John Hopkins, Yale, MIT, Stanford, and UCLA. Hopefully, this free resources will help you advance your knowledge of Biology towards a career in education, medicine, research, and agriculture. MOOCs are Massive Open Online Courses. They are university courses that have been put online, often with enhanced functionality such as Lecture Notes, mini-quizzes and other special features. These are University-level courses that have been put online. Many textbooks to help you learn biology online are now made available for free, in either PDF or Digital Format. We have listed here some of the more popular K-12 Resources available for learning Biology Online.

Allele Most multicellular organisms have two sets of chromosomes; that is, they are diploid. These chromosomes are referred to as homologous chromosomes. Diploid organisms have one copy of each gene (and, therefore, one allele) on each chromosome. For example, at the gene locus for the ABO blood type carbohydrate antigens in humans,[3] classical genetics recognizes three alleles, IA, IB, and IO, that determine compatibility of blood transfusions. The word "allele" is a short form of allelomorph ("other form"), which was used in the early days of genetics to describe variant forms of a gene detected as different phenotypes. Dominant and recessive alleles[edit] The term "wild type" allele is sometimes used to describe an allele that is thought to contribute to the typical phenotypic character as seen in "wild" populations of organisms, such as fruit flies (Drosophila melanogaster). Allele and genotype frequencies[edit] With three alleles: and Allelic variation in genetic disorders[edit]

Diversity In Nature :: :: Best Quality! Diversity "Diversity is not about how we differ. Diversity is about embracing one another's uniqueness." - Ola Joseph "United we stand, divided we fall." - Aesop (620 -560 B.C.) "Diversity: the art of thinking independently together." - Malcom Forbes "Love the one you're with." - Stephen Stills "Diversity is the magic. The greater the diversity, the greater the perfection." - Thomas Berry "We are eternally linked not just to each other but our environment." - Herbie Hancock "We cannot afford to be separate. . . . "I know there is strength in the differences between us. "Uniformity is not nature's way; diversity is nature's way." - Vandana Shiva "Share our similarities, celebrate our differences." - M. "Diversity is the one true thing we all have in common. Zap this page to your friends with One-Click-Forwarding!

Homework and Study Help - Free help with your algebra, biology, environmental science, American government, US history, physics and religion homework Can I take a course at HippoCampus for credit? How do I enroll in a course at HippoCampus? Are there any fees to take your courses? How do I make a comment or ask a question? How do I get individual help with my homework assignment? What are the preferred texts? How can I use HippoCampus in my classroom? How can I use HippoCampus in my home school? Can I use the resources you have available for my homeschoolers? Do you know of any wet lab resources to accompany HippoCampus content? Is there a script, app, or something that can be used to track student use of HippoCampus? Can I share my HippoCampus content with my fellow teachers? Can I download the video? Can I change the size of the video window? Why won't the Environmental Science animations play? What if my page scroll bars or "submit" button are not showing? I can't find closed captioning. Where does the content from your site come from? There is an error in the multimedia presentation. How do I report a course errata item? No. AP Course Ledger

It's Plantin' Time! One of the most anticipated science units in my classroom is our study of life cycles. We spend most of our fourth quarter studying the life cycles of plants, butterflies, frogs, and mealworms. It's one of my most favorite times of the year and one that my kiddos really look forward to! However, we had few glitches! We started out with a parts of a seed lab, observing, writing and comparing predictions about what we would find inside of our seeds. After a couple of days we got this and had to start over! I love how this student included the mold in her diagram! We labeled diagrams of plants and wrote about the job of each plant part. You can grab a copy of these charts in my TPT shop {HERE} Throughout the unit we read several nonfiction books about plants, used thinking maps to label the parts of the whole, categorize the parts we eat, and illustrate the stages of the life cycle. We also incorporated some comprehension strategies with this little cause and effect activity.

Norfolk Botanical Garden - Celebrating 75 years and still growing