Biology 115L Project - Input Form. 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. A magnifying glass can help you to see them more clearly, but they will still look tiny. Smaller cells are easily visible under a light microscope. It's even possible to make out structures within the cell, such as the nucleus, mitochondria and chloroplasts. To see anything smaller than 500 nm, you will need an electron microscope. Adenine. Genetics. The Gene School - General Information. As of July 1, 2013 ThinkQuest has been discontinued.
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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. Morgan: table of contents. Understanding Genetics: Human Health and the Genome. 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)*. A brown-eyed man marries a blue-eyed woman and they have three children, two of whom are brown-eyed and one of whom is blue-eyed. (* 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. A photo, taken by Dr. Dihybrid Cross: If the man is both Rr and Tt (How do we know that?)
Multiple Alleles and Codominance: World Builders: Punnet Squares E Viau CSULA. Punnett Squares Punnett Squares are diagrams used by scientists to help them to figure out how inherited traits (characteristics) will be distributed.
The yellow rectangles show the genes that the parents have. The genes of one parent are in the two boxes at the top: the A and the A. This parent has one copy of this gene on each of two chrosomes. The genes of the second parent are in the two boxes at the left side of the diagram: a and a. This parent also has a pair of chromosomes with one of these genes on each one of the pair. The green boxes represent what each of four children will inherit. Each child inherits one gene on the chromosome it gets from each parent. One gene plus one gene = 2 genes: in this case, Aa. You may want to use Punnett squares to explain how your life forms pass on characteristics, or to help you to figure out what is going on in the Chromosome Kindergarten! Let's try some samples and see how these squares can help us. The orange bird has two dominant Agenes. Using the Internet to Do Punnett Squares. Summary:Using a computer connected to the Internet, the student will construct and use Punnett squares of monohybrid crosses to explain how genetic traits are passed to offspring.
Main Curriculum Tie: Science - 7th GradeStandard 4Students will understand that offspring inherit traits that make them more or less suitable to survive in the environment. Materials: computer lab (1 computer per 1-3 students) or TV or Video projector connected to a demonstration computer paper and pencil Background For Teachers:This lesson is best done after students have been introduced to the concept of the Punnett square and how it is used to predict possible traits of offspring.
A Punnett square looks like a box divided into four squares. Intended Learning Outcomes:1. Instructional Procedures:1. 2. 3. Before you click the "Breed" button, write down a Punnett square showing your predictions of what the offspring will look like for the chosen trait.