{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

problem set 1 answers

problem set 1 answers - Page 1 of 5 Name Problem Set 1...

Info icon This preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Page 1 of 5 Name______________________________ Problem Set 1 Biology 313. Principles of Genetics Due date: Friday Feb 1, 12:10 PM Turn in a hard copy at the Biol 313 lecture For clarity, the answers we wrote out here are in general much longer than we require from you. The essential answer for each question is contained in a box and the rest involves explanations. Question 1. (3 points total) a.) (2.5 points, 0.5 points each diagram) A particular animal species has four chromosomes (2n = 4). Each diagram below depicts a cell in either M phase (mitosis) or meiosis. For each diagram, indicate (i) whether it depicts meiosis or mitosis, (ii) the particular stage, and (iii) the substage if it is in meiosis. (i) mitosis mitosis meiosis mitosis meiosis (ii) metaphase prophase prophase II anaphase anaphase I acceptable: acceptable: prometaphase telophase I (iii) II I b.) (0.5 points) A sunflower has a diploid chromosome number of 2N = 34. How many chromatids are present in one of this sunflower’s cells at prophase II of meiosis? Meiosis II follows the reduction division of meiosis I, so in Meiosis II there should be 17 centromeres in each of the 2 cells. In prophase II there are still 2 chromatids per centromere so: 2 x 17 = 34 chromatids Question 2. An amateur maize breeder thinks she may have discovered a gene that allows high ethanol yields when processing cellulosic corn biomass (corn stover, usually left in the field after harvest). She isolates true breeding strains for high ethanol and low ethanol and crosses them to produce an F1. The F1 is self fertilized. When 2,000 of the F2 corn plants are evaluated for ethanol production, 536 are high-ethanol and 1464 are low-ethanol. a.) (1 point) Propose a simple genetic hypothesis to explain these data.
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Page 2 of 5 Name______________________________ Since the ratio of low-ethanol to high-ethanol in the F2 generation is close to 3:1, the genetic
Image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern