Hardy Weinberg Gizmo Latest 2022 Already Passed Download Now and Score A+

Vocabulary: allele, genotype, Hardy-Weinberg equation, Hardy-Weinberg principle, heterozygous, homozygous, incompletely dominant, Punnett square Prior Knowledge Questions (Do these BEFORE using the Gizmo.) 1. A bird’s feather color is controlled by two alleles, D (dark feathers) and d (lighter feathers). Suppose two Dd birds mate. What percentages of DD, Dd, and dd offspring would you predict? Use the Punnett square at right to help determine your answer. 2. In this situation, what ratio of heterozygous (Dd) to homozygous (DD and dd) offspring would you expect to find? Gizmo Warm-up Many factors—immigration, natural selection, hunting, etc—can influence the composition of a population. To determine if one of these factors is affecting a population, it is useful to know what a population looks like when none of these factors is present. In 1908, Godfrey Hardy and Wilhelm Weinberg independently discovered the laws that govern such populations. These laws can be explored in the Hardy-Weinberg Equilibrium Gizmo. 1. The parrots you see represent a population of 500 parrots. For these parrots, the D allele is incompletely dominant over d, which means that Dd parrots are intermediate between DD and dd parrots. In the Gizmo, select the TABLE tab. How many parrots of each genotype are in the initial population? 2. Return to the DESCRIPTION tab. Click Begin, and then click Breed. What happens? 3. Click Hatch, and look on the TABLE tab. What are the parrot populations now? Reproduction for educational use only. Public sharing or posting prohibited. © 2020 ExploreLearning™ All rights reserved DD 25 Dd 50 dd 25 3:1 DD 250 Dd 100 dd 150 The birds breed and lay eggs. DD 184 Dd 223 dd 93 Question: How will the proportion of genotypes and alleles change over time when mating is random and no natural selection is occurring? 1. Predict: How do you expect the proportions of D and d alleles to change over time? 2. Gather data: Run a generation in the Gizmo. After clicking Hatch, fill in the allele and genotype percentages for generation 1. Repeat this process for 5 generations. 3. Analyze: What patterns do you see in your data? 4. Interpret: Select the ALLELE GRAPH tab. What does this graph show? 5. Interpret: Select the GENOTYPE GRAPH tab. What does this graph show? Reproduction for educational use only. Public sharing or posting prohibited. © 2020 ExploreLearning™ All rights reserved Activity A: Alleles and genotypes Get the Gizmo ready: ● On the DESCRIPTION tab, click Reset. ● Check that DD is 50% and dd is 30%. I expect the overall population of the heterozygous parrots. Initial values Generation 1 2 3 4 5 % D alleles 60 59 59.3 57.5 59.1 59.7 % d alleles 40 41 40.7 42.5 40.9 40.3 % of DD genotype 50 35.6 36.6 33.6 40.9 40.3 % of Dd genotype 20 46.8 45.4 47.8 47.8 48.2 % of dd genotype 30 17.6 18 18.6 17 16.2 The pattern is a decrease in the percentage of D alleles, an overall increase in the percentage of D alleles, major decrease in the percentage of the DD genotype, major increase in the percentage of the Dd genotype, decrease in the percentage of the dd genotype. this graph shows the allele percentage throughout each of the generations, showing both the percentage of D alleles and d alleles expressed in 2 different colors. the genotype graph shows the genotype percentage, giving all 3 types of possible genotypes: DD, Dd, and dd. 6. Gather data: On the DESCRIPTION tab, click Reset. Set DD and dd to any values you like. Fill in the initial values in the table below, and then run the Gizmo for five generations. Record the allele and genotype percentages for each generation in the table below. 7. Analyze: Do the patterns you noticed in the first experiment appear in the second? Explain. 8. Draw conclusions: The Hardy-Weinberg principle states that the proportions of alleles and genotypes in a population will remain stable as long as the following criteria are satisfied: ● Mating is random. ● There is no immigration or emigration. ● No natural or artificial selection is occurring. ● There is no mutation. ● The population is relatively large. How well does the Hardy-Weinberg principle describe this population of parrots? 9. Think and discuss: Would you say that this parrot population is evolving? Explain. Reproduction for educational use only. Public sharing or posting prohibited. © 2020 ExploreLearning™ All rights reserved Initial values Generation 1 2 3 4 5 % D alleles 34 34 33.3 29.3 28.9 28.6 % d alleles 66 66 66.7 70.7 71.1 71.4 % of DD genotype 28 13.2 13.2 7.6 7.6 8.0 % of Dd genotype 12 41.6 40.2 43.4 42.6 41.2 % of dd genotype 60 45.2 46.6 49 49.8 50.8 the pattern is somewhat the same for the % of alleles but the amount of homozygous alleles are very different. there is random mating, no immigration, no mutations, no natural/artificial selection, and there is a large population. no. the alleles aren’t changing they’re combining with another allele. Evolution would involve a mutation in a gene and cause a different allele to come into play.