Unit 2 Mendelian Genetics

Unit 2 Mendelian Genetics

No reproduction without written consent of Stride, Inc. Page 1 of 2 History | Lesson Answer Key | The New Republic Graded Assignment Unit Assessment, Part 2: Mendelian Genetics Complete this teacher-scored portion of the assessment and submit it to your teacher. Total score: ____ of 15 points (Score for Question 1: ___ of 5 points) 1. Discuss how crossing-over leads to greater variability of phenotypes. Give an example to help explain your answer. Answer: Type your answer here. (Score for Question 2: ___ of 5 points) 2. Assume you are performing a cross between a plant that is heterozygous for the dominant traits red flowers and wrinkled seeds, with a plant that is homozygous for the recessive traits white flowers and smooth seeds. Assume the alleles are R for red flowers, r for white flowers, W for wrinkled seeds, and w for smooth seeds. The offspring of this cross show the following phenotypes: 43 red flowers and wrinkled seeds 7 red flowers and smooth seeds 9 white flowers and wrinkled seeds 41 white flowers and smooth seeds What are the traits of the recombinant offspring in terms of flower color and seed shape? Explain how you know that these offspring are recombinant. What alleles would you expect to see in the individual chromosomes of each parent before and after crossing-over takes place? What is the recombination frequency? What is the distance between the genes in map units? Answer: Type your answer here. (Score for Question 3: ___ of 5 points) 3. What differences would you expect to see in a population made up of individuals whose chromosomes experience crossing-over frequently compared with a population made up of individuals whose chromosomes do not cross over? Explain your reasoning. Answer: Type your answer here. © 2015 K12 Inc. All rights reserved. Copying or distributing without K12’s written consent is prohibited. Page 2 of 2


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