Description

This assignment is marked out of 100 possible points and is worth 10% of your final grade. It is based on Units 1 to 5. Complete it after Lesson 2 of Unit 5 and use the appropriate Assignment Drop Box to submit it to your academic expert for grading.

Unless otherwise directed, the information you need to answer these questions is available in the course materials. Further research is not required. Some questions may require information from more than one unit or lesson.

Answer the questions in your own words, using full sentences.

1.      Review your own definition of gene from the list of Key Terms in Unit 1 Lesson 1. Quote three sentences from Chapter 1 in Lewis describing the term “gene” and provide in-text citations for them. Paraphrase these text sentences into one or two sentences to describe a gene in your own words. Provide a citation for your paraphrase.                                                         (3 marks)

Note: All citations in this course must include the page number, but they may be in any format you are familiar with, e.g., APA, MLA, CSE. If you need to, search the AU Library for information on citation. Note the reference to the course text in the References List (APA), Works Cited (MLA) or References or Works Cited (CSE) at the end of your assignment.

For each of questions 2–5, select and support the most appropriate response, and explain why each of the incorrect statements is eliminated.

2.      In a diploid cell undergoing mitosis, the centromeres of the chromosomes will

a.      replicate during prophase.

b.      divide when chromosomes are synapsing.

c.       segregate to the same pole of the cell during anaphase.

d.      divide in the reductional division.

e.      attach to spindle fibres.                                                                                              (5 marks)

3.      Meiosis in an oocyte

a.      creates four cells that are identical in size.

b.      results in qualitatively genetically different meiotic products.

c.       has an equational division in M I.

d.      segregates homologous chromosomes in M II.

e.      creates new allele combinations, along non-sister chromatids, during telophase I.            (5 marks)

4.      Alleles of a gene

a.      are located in various locations of a chromosome.

b.      originate through mutation.

c.       always create a variant of the gene’s protein detectable in the phenotype.

d.      differ in a person’s gene pool.

e.      are different on sister chromatids in mitosis.                                                                        (5 marks)

5.      Two genetically identical organisms express slightly different phenotypes for a given trait when raised in different environments. This is an indication that

a.      environmental components have a large effect on the expression of the phenotype.

b.      this phenotype is not multifactorial.

c.       the trait is determined by a single gene.

d.      the environment is equally important to the phenotype as the genotype.

e.      the phenotype is multifactorial but the genotype strongly influences the phenotype.                                                                                                                                             (5 marks)

6.      Match each description or example (letter list) in the right-hand column to the best term in the left-hand column (number list). Use only one description per term and one term per description.                                                                                                               (8 marks)

7.      Describe how the features of the nucleus, and its components and molecules, enable the functions of storage, protection, use, and transmission of genetic information.        (6 marks)