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Moore, Timothy Moore, Timothy Instructor: Mrs. Tammy Moore Class: VHSG Online Biology 14 August 2010 EXPERIMENT 8.3 Sex-linked Genetic Traits Understanding how sex-linked traits are passed from parents to offspring Abstract [What you will put here: Summarize the whole report in one, concise paragraph of about 100-200 words. You cannot write the abstract until after you've completed the report. Because it assumes that you will speak to your conclusion or what you learned in brief.] Introduction [What you will put here: In this introduction, some background is provided for the reader (sources are noted in the reference section at the end of the report).Typically, the introduction states the problem to be solved or the experiment to be performed and explains its purpose and significance. It also provides whatever background theory, previous research, or formulas the reader needs to understand to perform the experiment (or solve the problem).] Methods and Observations Materials Lab notebook Background: Historically, the English and Russian royalty had problems with hemophilia, a disease that inhibits the blood’s ability to form clots. People with this disease are prone to excessive bleeding. In fact, it is very possible for hemophiliacs to bleed to death as a result of minor cuts. This devastating disease is a Moore, Timothy sex-linked, recessive characteristic. Queen Victoria of England was heterozygous in this trait. Thus, she carried the recessive allele for hemophilia, but since she had the dominant allele on her other Xchromosome, she did not actually have the disease. Procedure: Since this trait is sex-linked, the allele is designated as Xh. The “h” is lower case because it is recessive. As Queen Victoria was heterozygous, she must have been XHXh. Her husband did not have hemophilia, so his genotype would have to have been XHY. Using this information, I drew a Punnett square that would illustrate what their children’s genotype might be. I found that [insert your findings here.] Leopold, the son of Queen Victoria and her husband, was a hemophiliac. His genotype was [insert the genotype of Leopold.] Hemophilia can also be present in females. I created a Punnett square showing how it is possible to produce hemophiliac females. [Use whatever genotypes you need for the parents in order to get a female offspring with hemophilia.] DATA: [Include your Punnett squares and findings here.] Conclusion My observations [You must explain, analyze, and interpret your results, being especially careful to explain any errors or problems.] References Dr. Jay L Wile and Marilyn F. Durnell Apologia Exploring Creation with Biology, 2nd edition, copyright 2005 Apologia Educational Ministries, Inc