Midterm1Key.a10

Midterm1Key.a10 - PLANT BIOLOGY 113, SPRING 2010 APRIL 22,...

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

View Full Document Right Arrow Icon
PLANT BIOLOGY 113, SPRING 2010 MIDTERM #1 PAGE 1 APRIL 22, 2010 NAME KEY HARD COPY OF ANSWERS DUE BY 5 PM, FRIDAY, APRIL 23 IN THE PLANT BIOLOGY OFFICE, 1002 LS (note - the office is closed between noon and 1 pm and at promptly at 5 pm). You can use your notes, the course website, and text only. You are operating under the UC Davis Code of Academic Conduct - DO NOT CONSULT WITH ANYONE ABOUT THIS EXAM. Please be sure that you have seven pages. Some of the examples are hypothetical. 300,000 POINTS TOTAL QUESTION 1 (15,000 POINTS) : What is the difference between the sporic and gametic life cycles? Which life cycle do plants undergo? 1. Sporic life cycle: diploid organism produces spore, spore develops into gametophyte, gametophyte produce gametes (5,000 points). Gametic life cycle: gametes produced directly from diploid organism (5,000 points). 2. Plant undergo the sporic life cycle (5,000 points). QUESTION 2A (10,000 POINTS) : What is the C-value paradox? Organismal complexity does not correlate with haploid genome size. QUESTION 2B (15,000 POINTS) : Many plants are polyploid. Does polyploidization explain the C-value paradox? The C-value paradox states that organismal complexity does not correlate with haploid genome size. Although polyploids have more total nuclear DNA than diploids, haploid genome size is not affected appreciably. Therefore, polyploidy does not explain the C-value paradox.
Background image of page 1

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

View Full DocumentRight Arrow Icon
PLANT BIOLOGY 113, SPRING 2010 MIDTERM #1 PAGE 2 APRIL 22, 2010 NAME KEY QUESTION 2C (20,000 POINTS) : The vast majority of all genes are in single or low copy DNA. The graph plots the fraction of single copy DNA in a genome versus genome size for a number of different plant species. Assume that all of these plants share the same organismal complexity. What does the graph tell you about the relationship between single copy DNA complexity and organismal complexity? Explain your answer. 1. The graph shows that the complexity of single copy DNA does not correlate absolutely with organismal complexity (10,000 points). 2. At small genome sizes, the fraction of single copy DNA decreases with increasing genome size, suggesting that the increase in genome size results largely due to an increase in repeated DNA (5,000 points). Thus, there appears to be some correlation between single copy DNA complexity and genome size. However, at larger genome sizes, the fraction of single copy DNA remains constant. This indicates that the absolute amount of single copy DNA increases with increasing genome size (5,000 points). Thus, plants with large genomes have more single copy DNA than plants with smaller genome size. 3. Because all plants have, more or less, the same organismal complexity, single copy DNA complexity does not correlate with organismal complexity.
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 06/23/2010 for the course PLB 113 taught by Professor O'neil during the Spring '09 term at UC Davis.

Page1 / 7

Midterm1Key.a10 - PLANT BIOLOGY 113, SPRING 2010 APRIL 22,...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online