background preloader

Introduction To Heredity

Introduction To Heredity
The 2004 publication Investigating Safety: A Guide for High School Teachers by Texley et al. has raised an alarm in the teaching community about the usefulness and safety of PTC taste testing. This has led to PTC being banned from many schools and districts - we believe unnecessarily. Yes, PTC is toxic. In rats, the most sensitive animals tested, the oral LD50 of PTC (the amount that killed 50% of test animals) is 3 mg/kg. However, PTC is so intensely bitter that tasters can detect it in miniscule quantities. A single test paper from Carolina Biological Supply contains just 0.007 mg of PTC. There is no question that PTC is toxic (LD50 in rat is 3mg/kg, in mouse 10mg/kg, and in rabbit 40mg/kg), but so is table salt (acute toxicity in humans at 500-1000mg/kg).

Related:  BiologyScience sequenceGenetics

How to Extract DNA from Anything Living First, you need to find something that contains DNA. Since DNA is the blueprint for life, everything living contains DNA. For this experiment, we like to use green split peas. Activity Detail What You'll Need WaterSaltShampoo or dish soap (clear shampoo with EDTA, such as Suave Daily Clarifying, works best)Cold 70% to 95% isopropyl alcohol (place in freezer overnight)Ziploc-type bagStrawberries or other foods like grapes, kiwi, tomatoes, bananas or lettuceTest tubeCoffee filterPlastic cupPipette What to Do Create the DNA extraction buffer by mixing 450 milliliters of water with two teaspoons of salt. Gently add 50 milliliters of shampoo (this recipe is enough for 50 groups of students).

Teacher Resources - GeneEd - Genetics, Education, Discovery Lesson plans, genetic educational materials, printable activity sheets, and other teaching resources for educators seeking to increase genetic and genomic literacy. Biostatistics Basic Probability and Chi-Squared Tests (Lesson Plans/Lesson Activities) Description: An expert authored advanced in-class exercise teaching critical skills for classic genetic analysis, including probability, making predictions, and assessment. Lesson Plan: Characteristics of Living Things Review with students these six easily observable characteristics of living things: movement (which may occur internally, or even at the cellular level) growth and development response to stimuli reproduction use of energy cellular structure The student data table includes links to all the information and videos necessary to complete this activity. Entire class—projecting the videos Click on each link in the "Category" column on the data table. Students can take turns reading the introductions aloud. Show the videos and have the students complete the data table for each organism.

Saving Sam This is an activity for the first day or as an introduction to the scientific method or to just allow students to work in groups so that you can get to know them better. I usually do all instructions verbally and don't require any written documents for turning in. There is a link to a handout that students can use to answer questions and discuss strategies. 5 Helpful Tips for Teaching Genetics This post originally appeared on the blog Biology Roots. Here is #2 for my “5 Helpful Tips” series. If you missed the first one, check out 5 Helpful Tips for Teaching Photosynthesis.

1. Is it alive? What does it mean to be alive? Is a cactus alive? Is a seed alive? Is the air we breathe alive? What are the necessary characteristics? To hook students into ... Find Your Path through the NGSS The Next Generation Science Standards provide a framework and examples for STEM learning. Grounded in the National Academy of Science's thoughtful Framework for K-12 Science Education, these new K-12 science standards have been developed to provide students an internationally benchmarked science education, and signify a new direction for STEM education. They elevate the importance of Earth science, present engineering education as coequal with science education for the first time and emphasize a key set of Scientific and Engineering Practices and Crosscutting Concepts that should buttress all learning in these disciplines. The NGSS hold the potential for helping focus the current national concern for improving STEM education. They will undoubtedly help bring clarity and unity to the patchwork of state standards developed throughout the standards movement in the past decades.

First identical twins with different skin colour born in the UK  Identical twins Amelia and Jasmine are thought be the first black and white twins born in the UK, despite coming from the same egg. The girls were born to mum Libby Appleby, 37, from West Rainton, County Durham who is white and her partner Tafadzwa Madzimbamuto, 40, who is black. They are identical or monozygotic twins, meaning they developed from the same zygote, which split and formed two embryos. Scroll down for video Libby Appleby, 37, from West Rainton, County Durham was told she wouldn't be able to tell her identical twin babies apart.