LS7B _ W23 Midterm 1 (pdf) - Course Sidekick

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University of California, Los Angeles *

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LS7B

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Biology

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Feb 20, 2024

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3/20/23, 10:20 AM Midterm I: 23W-LIFESCI-7B-LEC-1 Genetics, Evolution, and Ecology  This quiz has been regraded; your new score reflects 2 questions that were affected. Midterm I Due Feb 3 at 11:59pm Points 96 Questions 32 Available Feb 3 at 6am - Mar 17 at 11:59pm Time Limit 120 Minutes Instructions This quiz was locked Mar 17 at 11:59pm. Attempt History Attempt Time Score Regraded LATEST Attempt 1 120 minutes 72 out of 96 78 out of 96 Please READ this entirely before beginning your exam: The exam is available from 6AM PST to 11:59PM PST on Friday, Feb 3 . Once you begin the exam, you have 120 minutes (2 hours) to complete it. Once you start the exam, you must complete the exam. Any exam that is still open at 11:59PM PST, or open for longer than 120 minutes, will be automatically submitted. If you start the exam later than 9:59PM PST, then you will not have the full 120 minutes. The individual phase of the midterm has 32 questions, each worth three points. For multiple True/False questions, each question is independent of the other questions. The exam is open book and open note (you may use Achieve, Bruinlearn, and your own notes), but you may not use other internet sites or work with other students during the exam. Your performance on the exam is meant to evaluate your individual effort. You are not allowed to take screenshots for any reason, post questions to third party sites (e.g. Chegg), share any version of the exam you have with other students, or collaborate on this exam in any way. Any of these will be considered an act of academic misconduct and will be reported to the Dean of Students with no exceptions. Please email your instructor immediately if you experience any technical difficulties during the exam. rd

https://bruinlearn.ucla.edu/courses/155637/quizzes/956056?module_item_id=5854993 1/28 Score for this quiz: 78 out of 96 Submitted Feb 3 at 11:50am This attempt took 120 minutes. 3/20/23, 10:20 AM Midterm I: 23W-LIFESCI-7B-LEC-1 Genetics, Evolution, and Ecology [Questions 1-4] Imagine an autosomal co-dominant trait with three different alleles: D, E, and F. For each of the following families, identify the possible nondisjunction events (rare mistakes during meiosis) that could explain the genotype of the offspring. Assume no recombination occurs. 3 / 3 pts Question 1 The XX Parent has genotype EE and the XY Parent has genotype EF. They have a triploid XY offspring that has genotype EEF. This could have occurred through non-disjunction in meiosis II of the XY parent. True False Correct! Correct! Distinguish between sister chromatids and homologous chromosomes Visualize how meiosis produces four haploid gametes Week 1 handout and clicker questions Week 3 clicker questions 3 / 3 pts Question 2

https://bruinlearn.ucla.edu/courses/155637/quizzes/956056?module_item_id=5854993 2/28 The XX Parent has genotype DF and the XY Parent has genotype EF. They have a triploid XX offspring that has genotype DFF. This could have occurred through non-disjunction in meiosis II of the XY parent. 3/20/23, 10:20 AM Midterm I: 23W-LIFESCI-7B-LEC-1 Genetics, Evolution, and Ecology True Correct! Correct! False Distinguish between sister chromatids and homologous chromosomes Visualize how meiosis produces four haploid gametes Week 1 handout and clicker questions Week 3 clicker questions 3 / 3 pts Question 3 The XX Parent has genotype DF and the XY Parent has genotype EF. They have a triploid XY offspring that has genotype DEF. This could have occurred through non-disjunction in meiosis I of the XX Parent. True Correct! Correct! False Distinguish between sister chromatids and homologous chromosomes Visualize how meiosis produces four haploid gametes Week 1 handout and clicker questions Week 3 clicker questions

https://bruinlearn.ucla.edu/courses/155637/quizzes/956056?module_item_id=5854993 3/28 3 / 3 pts Question 4 3/20/23, 10:20 AM Midterm I: 23W-LIFESCI-7B-LEC-1 Genetics, Evolution, and Ecology The XX Parent has genotype DF and XY Parent has genotype DE. They have a triploid XX offspring that has genotype DEF. This could have occurred through non-disjunction in meiosis I of the XY Parent. True Correct! Correct! False Distinguish between sister chromatids and homologous chromosomes Visualize how meiosis produces four haploid gametes Week 1 handout and clicker questions Week 3 clicker questions [Questions 5 - 7] You are a genetic counselor and are meeting with a couple, one of which is affected by Familial glucose-galactose malabsorption (a rare recessive autosomal disorder). They are planning on starting a family and are interested in knowing the probability that their children may or may not have Familial glucose-galactose malabsorption. 3 / 3 pts Question 5

https://bruinlearn.ucla.edu/courses/155637/quizzes/956056?module_item_id=5854993 4/28 If the XY parent is affected and they have two children, one XX and one XY offspring, the probability the XY offspring is affected is twice the probability that the XX offspring will be affected. True 3/20/23, 10:20 AM Midterm I: 23W-LIFESCI-7B-LEC-1 Genetics, Evolution, and Ecology False Correct! Correct! Calculate the probability of a particular gamete being produced from an individual, assuming independent segregation of alleles Use pedigree analysis to calculate the likelihood an individual will have a particular genotype or phenotype Use the multiplication and sum rule Weeks 1 and 2 clicker questions Lab Weeks 3 and 4 3 / 3 pts Question 6 Assume the XY parent is affected, and the XX parent is a carrier. If they have two children, what is the probability that both children will be unaffected? 12/16 9/16 3/16 1 7/16

https://bruinlearn.ucla.edu/courses/155637/quizzes/956056?module_item_id=5854993 5/28 None of the other answer choices are correct Correct! Correct! 3/20/23, 10:20 AM Midterm I: 23W-LIFESCI-7B-LEC-1 Genetics, Evolution, and Ecology Calculate the probability of a particular gamete being produced from an individual, assuming independent segregation of alleles Use pedigree analysis to calculate the likelihood an individual will have a particular genotype or phenotype Use the multiplication and sum rule Weeks 1 and 2 clicker questions Lab Weeks 3 and 4 Original Score: 0 / 3 pts Regraded Score: 3 / 3 pts Pregunta 7 ± This question has been regraded. Assume the XY parent is affected, and the XX parent is a carrier. If they have two children, what is the probability that both children will have the same genotype? 1/4 1/2 Correct! Correct! 9/16 3/16 None of the other answer choices are correct

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