Problem Set #1-BIOS 230 Spring 2023

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Lewis University *

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CHEM-301

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Biology

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Feb 20, 2024

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5

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©Karin Nelson 2023 Print your name + UIN:________________________________ BIOS 230-Spring 2023 Problem Set #1 - 47 pts. Due SATURDAY, February 11 at 11:59 p.m. Instructions: Do your own work (but ask us if you need help). Show all your work for full credit. Write legibly —if we can’t read it, you don’t get credit. Use all digits during calculations, but take all final answers out to 4 decimal points unless otherwise instructed. Circle your final answer. Submit your work through Blackboard Assignments in PDF, JPEG, or Word formats ONLY we cannot read or accept HEIC format. DON’T post this assignment to any website. No late homework will be accepted! https://srelherp.uga.edu/snakes/thasir.htm https://www.boredpanda.com/unusual-animal-colors/?utm_source=google&utm_medium=organic&utm_campaign=organic In Cirtalus’ belt ed snake, a single gene determines skin color. The gene has two alleles, B and b ; simple dominance rules apply the dominant allele causes the common brown coloration; homozygous recessive individuals are multi-colored (rainbow). In a sampled population, it is determined that the b allele has a frequency of 0.031. 1. What is the frequency of the B allele? Show your work and carry to 4 decimal places. (2 pts.) 2. What are the three possible genotypes? (3 pts.)
©Karin Nelson 2023 3. What are the frequencies of each of these three genotypes? (6 pts.) 4. In a population of 8,000 Cirtalus’ belt ed snakes, how many would you expect to be rainbow colored (bb)? Round off to the nearest whole animal. (2 pts.) *************************************************** Tail shape in royal empennaged guppies (a type of freshwater fish) is determined by one gene with two alleles, R (round shape) and r (fan tail); simple dominance rules apply. In an aquarium with a population of 150 empennaged guppies, you observe the following genotypes: RR (Round tail) 67 individuals Rr (Round tail) 45 individuals rr (Fan tail) 38 individuals *** For the following questions, do NOT assume population is in Hardy-Weinberg Equilibrium. Take all your final answers out to 4 decimal places. *** 5. Calculate the allele frequencies of R. (2 pts.) 6. Calculate the allele frequencies of r. (2 pts.)
©Karin Nelson 2023 Congratulations your guppies had babies! In this second generation of guppies, the genotypes are: RR (Round tail) 230 individuals Rr (Round tail) 85 individuals rr (Fan tail) 135 individuals 7. Calculate the allele frequencies of R among the babies. (2 pts.) 8. Calculate the allele frequencies of r among the babies. (2 pts.) 9. Is the population of empennaged guppies above in Hardy-Weinberg Equilibrium? Explain (3 pts.)
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