problem set 1 answers

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

Info iconThis 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.
Background image of page 1

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

View Full DocumentRight 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 hypothesis would be complete dominance where the high-ethanol trait is recessive to the low-
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.

Page1 / 5

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

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