Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
There are 3 “project-style” questions on the pages that follow. They are questions that supply information first, then ask you to answer questions using that information. They will test the depth of your understanding of the topic. The scenario and the questions appear first, then the answers are on the next page. Good luck, even though it’s the effort you invest . . . Jillian is a student at McClintock High School in Tempe. Her middle school class learned about PTC tasting. As it turned out she is not a taster. She asked her teacher for test strips and found out everyone in her family is a taster. 1. Is it possible that Jillian cannot taste PTC when everyone in her family can? 2. What genotype for PTC tasting does Jillian have? 3. What genotypes are possible for her parents? 1. Is it possible that Jillian cannot taste PTC when everyone in her family can? Yes, it is possible that Jillian could have a recessive genotype as long as both of her parents have a heterozygous (Pp) genotype. If each parent passes the recessive allele, Jillian would not taste PTC. 2. What genotype for PTC tasting does Jillian have? 3. What genotypes are possible for her parents? Jillian’s genotype is (pp). Lower case letters are used for recessive alleles (versions of genes). See answer to first question above. Jillian’s parent must both have a heterozygous genotype to make it possible to have a child who has a homozygous recessive genotype. A dwarf pea plant (tt) is crossed with a pea plant of regular height (TT). All of the offspring have the genotype Tt. 1. 2. 3. How would you describe their phenotype? Is the genotype of the offspring heterozygous or homozygous? If seeds from these plants were pollinated by a dwarf plant, what genotypes would be possible for the offspring? 1. How would you describes their phenotype? 2. Is the genotype of the offspring heterozygous or homozygous? For the heterozygous genotype of Tt, the plant would have a regular height because the single dominant allele overpowers the recessive allele. The offspring genotype is heterozygous because it contains one dominant allele and one recessive allele. 3. If seeds from these plants were pollinated by a dwarf plant, what genotypes would be possible for the offspring? Using a genotype of tt for the dwarf plant, the Punnett square would look like: T t So there is a 50% chance of Regular height plants and 50% Chance of a dwarf -size offspring t Tt tt t Tt tt Steven went to a farm and picked a bright red tomato from a broken branch on the plant. The tomato had a rotten spot with a worm inside of it. Instead of eating the tomato, Steven decided to plant the seeds and grow new tomato plants. 1. Which feature of the plant is inheritable? 2. Do we know anything about the genotype of the plant? 3. What info would we need to predict the traits of the offspring? 1. Which feature of the plant is inheritable? Only the color of the tomato skin is an inheritable trait. The others depend on the environment 1. Do we know anything about the genotype of the plant? No, we don’t know the genotype because we don’t know the dominant color of the tomato skin. 1. What info would we need to predict the traits of the offspring? In order to predict the traits of the offspring, you need to know the genotype of the parents and the dominant variation.