mendels_experiments

mendels_experiments - Web Animation Mendels Experiments...

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Web Animation Mendel’s Experiments After reading the text, you should be able t o... Briefly explain the hypothesis of the inheritance of acquired characters. State at least four characteristics of a model organism. Define self-fertilization. After viewing this animation , you should be able t o... Predict the genotypes and phenotypes of offspring from a cross in which you know the genotypes of the parents. State the significance of a 3:1 ratio of phenotypes in the progeny of a cross. State the significance of a 9:3:3:1 ratio of phenotypes in the progeny of a cross. NARRATION Introduction Gregor Mendel conducted experiments to answer one of the fundamental questions of heredity: What are the basic patterns in the transmission of traits from parents to off- spring? In this re-creation of Mendel’s historic experiments, you will have the opportuni- ty to predict the outcome of two types of genetic crosses using a Punnett square. Inheritance of a Single Trait In this first example, the plants being mated differ in just one trait. One plant is homozy- gous for the dominant purple flower allele of a gene; the other is homozygous for a reces- sive white flower allele. To show the mating, we arrange the parent plants along two sides of the square. Note that each parent produces a single type of gamete. The genotype of each gamete produced by one parent (shown on the top) is brought down into each of the squares below it. Likewise, the genotype of each gamete produced by the other parent (shown on the left) is moved into each square to the right. The Punnett square allows us to predict the genotypes of the offspring.
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Exercise 1 Using the information provided, predict the phenotypes of the offspring. Drag the correct phenotypes to each square in the grid. Exercise 2
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mendels_experiments - Web Animation Mendels Experiments...

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