Genetics WSU MBIOS/BIOL 301, Exam 2, Dr. Julie Stanton, Spring Fall Newest Solution
What is the difference between monozygotic and dizygotic twins? - ANS ✔✔ - Monozygotic: Identical twins from the fertilization of one egg. Dizygotic: Fraternal twins from the fertilization of two eggs. What are the two forms of melanin? What colors do they produce? - ANS ✔✔ - Eumelanin: Yellow to brown to black. Pheomelanin: Red What is hair color determined by? - ANS ✔✔ - Total amount of melanin and Relative amount of eumelanin and pheomelanin Describe the Melanocortin-1 Receptor (MC1R) gene. - ANS ✔✔ - It effects the relative amounts of melanin. Mutations can result in red hair. MC1R is also found in the brain. Mutations are associated with resistance to local anesthetics. Red heads are twice as likely to avoid dental treatment because of pain sensitivity.
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