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BIO 184 Final Exam

BIOL100 Biology — exam and revision material · Other

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Biology exam material, 12 pages. Originally published on StudyMerit.

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12
Academic year
2025/2026
Language
English

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BIO 184 Final Exam Page 1 Fall 2009 FINAL EXAM KEY PART 1: MULTIPLE CHOICE QUESTIONS WITH ONLY ONE BEST ANSWER (2 pts each) For each question, circle the best answer. There is only one best answer for each question. If you wish to clar i fy your answer, you may write additional information in the margin to the right of the question. If you need to scribble, please use the back side of the exam pages. Only the front side of each exam page will be graded. 1. Sam and his wife are planning to have 4 children. The probability that they will have two girls and two boys (any order) is: a. 1/16 b. 1/8 c. 3/8 d. 1/2 e. None of the above 2. Bob and Janet have six daughters. The chance that their next two children will also be daughters is a. 1/256 b. 1/128 c. 1/16 d. 1/4 e. 1/2 3. A mouse with the genotype Ff,Gg,HH,mm can produce how many different types of gametes? a. 1 b. 2 c. 4 d. 8 e. 16 4. In runner bean, the D allele codes for dark green leaves while the d allele codes for leaves that are very pale green (almost cream-colored). A series of Dd plants were bred to each other and offspring were produced in the following phenotypic proportions: 35 dark green leaves: 1 pale green leaves. The most likely explanation for this ratio is: a. 6 genes control the trait b. “d” is a lethal allele c. “D” and “d” are codominant alleles d. “D” and “d” are incompletely dominant alleles e. “d” is a semi-lethal allele 5. W R codes for red hair and and W B codes for brown hair in Shirocco Camels. W R W B cattle have coats containing both red and brown hairs, intermixed. Which of the following statements is true? a. W R is completely dominant to W B b. W R and W B are incompletely dominant to one another c. W R and W B are codominant d. Coat color in Shirocco Camels is strongly influenced by the environment e. Coat color in Shirocco Camels is under the control of two different genes, W and B. Document shared on https://www.docsity.com/en/solved-final-exam-general-genetics-fall-2009-bio-184/6175427/ Downloaded by: dr-loveleen-samra (msalmostalwaysright@gmail.com)

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BIO 184 Final Exam Page 2 Fall 2009 6. All mutant fruit flies with curly wings are heterozygous (Cy,cy). The most likely explanation for this is that: a. the mutation causing curly wings is sex-linked b. the mutation causing curly wings is sex-influenced c. the curly mutation is dominant and is lethal in the homozygous state d. the curly mutation is recessive and lethal in the homozygous state e. flies with curly wings have a selective advantage For questions 7-9, refer to the paragraph below : In Chinese Hamsters, Y = yellow fur, y = agouti fur; B = brown eyes, b = gold eyes. A Chinese Hamster with the genotype Yy,Bb is test crossed and the following offspring are produced: 14 yellow fur, gold eyes; 16 agouti fur, brown eyes; 2 yellow fur, brown eyes; 1 agouti fur, gold eyes. 7. The map distance between the genes coding for fur color and eye color in Chinese Hamsters is approximately: a. 9.1 map units b. 0.091 map units c 0 map units d. 50 map units (and therefore these genes may not even be on the same chromosome) e. It’s not possible to estimate the map distance between these two genes from the data given. 8. The Yy,Bb parent carries the alleles in which linkage phase? a. Y and B on one chromosome and y and b on the other b. B and b on one chromosome and Y and y on the other c. Y and b on one chromosome and y and B on the other d. Y on one chromosome and b on the other (the test cross parent supplies the other chromosomes) e. None of the above; there is no evidence of linkage between these two genes. 9. The same cross is performed with a different pair of Chinese Hamsters and 19 offspring are produced. However, there are no offspring with agouti fur and gold eyes. The most likely explanation is that a. the combination of agouti fur and gold eyes is lethal b. the sample size was too small to observe them c. “g” is a recessive lethal allele d. “y” is a recessive lethal allele e. both “g” and “y” are recessive lethal alleles 10. A pure-breeding wisteria plant with lavender flowers is crossed with a pure-breeding wisteria plant with white flowers. The offspring all have lavender flowers. However, when the offspring are crossed to one another, the result is 108 offspring with lavender flowers, 48 with white flowers, and 36 with pink flowers. Which of the following is probably true? a. Flower color is controlled by a single gene with two incompletely dominant alleles. b. Wisteria plants with lavender flowers are monohybrids. c. Wisteria plants with lavender flowers are dihybrids. d. The allele for pink flowers is semi-lethal. e. None of the above 11. In a cross between Qq,Rr,tt and Qq,rr,tt, _____ % of the offspring will be QQrrTt. a. 50 b. 25 c. 12.5 d. 0 e. None of the above Document shared on https://www.docsity.com/en/solved-final-exam-general-genetics-fall-2009-bio-184/6175427/

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Jaden Marie Delilah Daisy BIO 184 Final Exam Page 3 Fall 2009 12. In humans, pattern baldness is an example of a. a sex-linked allele b. a Y-linked allele c. a sex-influenced allele d. a sex-limited allele e. None of the above For questions 13-18, examine the pedigree below. The disease running through the family is Salinger-Johns Disease, an autosomal recessive disorder that causes brittle bones . 13. What is probability that Jaden is a carrier for the disease? a. 1/4 b. 1/3 c. 1/2 d. 2/3 e. 1 14. What is the probability that Marie is a carrier for the disease? a. 1/4 b. 1/3 c. 1/2 d. 2/3 e. 1 15. What is the probability that Jaden’s and Marie’s first child will have the disease? a. 1 b. 1/4 c. 2/3 d. 1/6 e. None of the above 16. If Jaden and Marie have 3 children, what is the probability that none of them will have the disease? a. 1 b. 27/64 c. 1/64 d. 0 e. None of the above Document shared on https://www.docsity.com/en/solved-final-exam-general-genetics-fall-2009-bio-184/6175427/ Downloaded by: dr-loveleen-samra (msalmostalwaysright@gmail.com)

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