Use of PTC Paper – submitted by Dave Gervais, Chair STAO Safety Committee

Introduction:

Since its discovery in 1932, PTC paper has been a popular activity for students studying genetics. It is used to determine the genotypes of individuals, and is bitter tasting. It has been tied to the evolutionary advantage allowing some primates to detect toxins in a potential food. Foods containing PTC like substances may be avoided by tasters (broccoli, water cress).

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Chinese scientist reports 3rd pregnancy in baby-gene editing experiment | CBC News

As American researchers say they tried to discourage He Jiankui from pursuing what he claims are the world’s first genetically edited babies, the Chinese scientist insists he is proud of his work and revealed that another volunteer is pregnant.

Source: Chinese scientist reports 3rd pregnancy in baby-gene editing experiment | CBC News

Loop Game Genetics Review Revised – submitted by Nehal Patel

This is an update to Nehal’s Nov 27, 2018 post.  The game board required for this resource is now included below.  Our apologies to Nehal and all who opened the Nov 27 post for this omission.

Introduction:

The game involves students being dealt a set of cards, each with a question and an answer to a different question. Beginning with the student who has ‘START’ written on their card, they read out their question, and the student with the corresponding correct answer is required to read out the answer. That student then reads their question for another student to answer. The game continues until all questions have been answered and the sequence arrives to the ‘END’ card in which the loop is complete.

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Enzyme Activity Guided-Inquiry Lab Turnip Peroxidase – submitted by Flinn Scientific Canada

Peroxidase enzymes are widely distributed in plants and animals, including bacteria, to protect cells against the effects of oxidative stress and cell damage due to hydrogen peroxide. Peroxidases are easily extracted from turnips and other root vegetables and provide a model enzyme for studying enzyme activity—how the rate of an enzyme-catalyzed reaction depends on biotic and abiotic factors. Enzyme activity studies reflect enzyme structure and function and provide the foundation for understanding the mechanism or theory of enzyme action.

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Will You Still Eat Raw Fish After Watching This Video?

Have you ever noticed that warning about raw or undercooked seafood at the bottom of restaurant menus? Ever wondered why it’s there? Because fish carry a ton of parasites, and if they aren’t prepared correctly then those parasites can make it into your body. But it turns out, this fishy intersection with the wild world of parasites can teach us a lot about how these moochers help keep ecosystems healthy, and why we should protect them. Continue reading

How do cigarettes affect the body? – TED Ed by Krishna Sudhir

Cigarettes aren’t good for us. That’s hardly news — we’ve known about the dangers of smoking for decades. But how exactly do cigarettes harm us, and can our bodies recover if we stop? Krishna Sudhir details what happens when we smoke — and when we quit. Lesson by Krishna Sudhir, directed by TED-Ed. Continue reading