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Name: Date: BIO 340 Recitation #4: Bearded Dragon Coloration Bearded Dragons can have multiple unique traits and features, including Hypomelanism, translucency, a genetic stripe, leatherback trait, and temperature-sensitive sex reversal. Remember that most lizards have a ZW sex-determination system, where females have heterogametic chromosomes (ZW), and males have two homomorphic (ZZ) chromosomes. Note: I HIGHLY recommend you watch the Recitation #4 presentation for pictures/examples and comparisons of bearded dragon traits. Reminder: This recitation has been updated for Spring B 2024. Using answers from previous semesters assignment’s is a violation of academic integrity and will get you a zero. Trait Allele s Inheritance Pattern Hypomelanism H/h Autosomal Recessive Translucent T/t Autosomal Recessive Genetic Stripe G/g Autosomal Dominant Spikes B/L Co-dominant Sex Reversal Temperature-Sensitive Allele Amber is an adult female bearded dragon. A famous reptile breeder would like to know what possible variations of colors and markings she could have if she breeds her dragon “Zuko” with Amber. For this, she hired you as a genetics expert to know the possible offspring phenotypes. These are their genotypes: “Casper” Dragon A (ZZ): HhTTggBB “Amber” Dragon B (ZW): HhTtggBL
1) Using Punnett Squares, determine which genotypes are possible at each gene locus if you cross Parent A and Parent B (2 points, 0.5 points per Punnett Square). Hypomelanism (H/h): Translucent (T/t): Genetic Stripe (G/g) Spikes/Scales (B/L): 2) Circle/mark all the phenotypes/traits that are NOT possible for offspring of these two bearded dragons below. Hint: Analyze each locus from the Punnett Squares you created above. For each Punnett Square, are there any phenotypes missing from the offspring possibilities? Note: You will lose points for marking phenotypes that ARE possible. 2 pts. Hypo, translucent dragon with genetic stripe and wild-type spikes Hypo, non-translucent dragon with no genetic stripe and wild-type spikes Non-Hypo, non-translucent dragon, with wild- type spikes and no genetic stripe Hypo, non-translucent dragon with wild-type spikes and no genetic stripe Hypo, non- translucent dragon, with leatherback spikes and no genetic stripe Non-Hypo or translucent skin with genetic stripe and silkback (no spikes) 3) When eggs of bearded dragons are incubated in temperatures higher than 33° C, it can cause embryonic bearded dragons to change sex. Explain why this statement is true or false and provide one scientific reference supporting this conclusion (2 pts):
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