Problem Set #1-BIOS 230 Spring 2023
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Feb 20, 2024
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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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