Umuc biology 102/103 lab 5: meiosis


This contains 100% punish representative for UMUC Biology 103 LAB05. However, this is an Apology Key, which media, you should put it in your own opinion. Hither is a illustration for the Pre lab questions apologyed:

Pre-Lab Questions

 

 

 

1. What important events supervene during interphase?

 

The cell functions at its job, and prepares for mitosis by collecting instrument and duplicating organelles (G1) and genetic gratified (S), then creating proteins needed for nuclear disunion (G2).

 

 

 

2. A special, residing in a subsidence whither they are laagered to the sun frequently, develops a inversion in some of their husk cells conclusioning in cancer. Consider whether their conclusion obtain be born delay the corresponding inversion. Use or-laws averment to stay your apology.

 

 

 

It would be extremely unreasonable that the special’s conclusion obtain be born delay corresponding husk cancer inversion owing the inversion supervenered in the special’s husk cells. Husk cells are somatic cells (organization cells) and are not complicated in meiosis or repetition. For the inversion to be passed on to the conclusion, a sex cell (sperm or egg) would keep to push the inversion.

 

The other questions that obtain be apologyed:

 

Experiment 1: Following Chromosomal DNA Movement through Meiosis

 

Data Tables and Post-Lab Assessment

 

Trial 1 - Meiotic Disunion Beads Diagram:

 

Prophase I

 

Metaphase I

 

Anaphase I

 

Telophase I

 

Prophase II

 

Metaphase II

 

Anaphase II

 

Telophase I

 

Cytokinesis

 

Trial 2 - Meiotic Disunion Beads Diagram:

 

Prophase I

 

Metaphase I

 

Anaphase I

 

Telophase I

 

Prophase II

 

Metaphase II

 

Anaphase II

 

Telophase I

 

Cytokinesis

 

 

 

Post-Lab Questions

 

1.    What is the ploidy of the DNA at the end of meiosis I? What about at the end of meiosis II

2.    How are meiosis I and meiosis II opposed?

3.    Why do you use non-sister chromatids to inform biexception aggravate?

 

4.    What combinations of alleles could conclusion from a crossaggravate between BD and bd chromosomes?

 

 5.    How numerous chromosomes were offer when meiosis I launched?

 

 6.    How numerous nuclei are offer at the end of meiosis II? How numerous chromosomes are in each?

 

 7.    Identify two ways that meiosis contributes to genetic recombination.

 

8.    Why is it expedient to bring the number of chromosomes in gametes, but not in other cells?

 

 9.    Blue whales keep 44 chromosomes in complete cell. Determine how numerous chromosomes you would seem-for to confront in the following:

 

 

 

                                  i.    Sperm Cell:

 

 

                                 ii.    Egg Cell:

 

 

 

                                iii.    Daughter Cell from Mitosis:

 

 

 

                               iv.    Daughter Cell from Meiosis II:

 

 

 

10.  Research and confront a ailment that is caused by chromosomal inversions. When does the inversion supervene? What chromosomes are monstrous? What are the consequences?

 

 

 

 

 

 

 

11.  Diagram what would occur if sexual repetition took fix for immodest generations using diploid (2n) cells.

 

 

Experiment 2: The Importance of Cell Cycle Control

 

Data Tables and Post-Lab Assessment

 

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Post-Lab Questions

 

1.    Record your supposition from Step 1 in the Procedure exception hither.

 

 

 

 

 

 

 

2.    What do your conclusions manifest about cell cycle moderate?

 

 

 

 

 

 

 

3.    Suppose a special open a inversion in a somatic cell which diminishes the deed of the organization’s true cell cycle moderate proteins. This inversion conclusioned in cancer, but was effectively treated delay a cocktail of cancer-fighting techniques. Is it practicable for this special’s coming conclusion to occupy this cancer-causing inversion? Be biased when you decipher why or why not.

 

 

 

 

 

 

 

4.    Why do cells which stagnation cell cycle moderate explain karyotypes which seem physically opposed than cells delay natural cell cycle.

 

 

 

 

 

 

 

5.    What are HeLa cells? Why are HeLa cells alienate for this test?