BIOL 130 Lecture Notes - Lecture 24: Escherichia Coli, Sulfur, Bacteriophage

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ceriseweasel496

21 Nov 2016

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Review of meiosis i: goes form 1 diploid to 2 haploid cells, meiosis 2 goes through the same process of meiosis 1. Results in 2 more new daughter cells with different dna. Unique events in prophase i increase genetic diversity: pairing of homologous chromosomes, dna breakage and repair in prophase i. Prophase i: breakage in dna, same breakage is tightly regulated and not random. Occur on the place on each sister chromatid. This is where crossing over occurs: chiasmata help align homologous chromosomes in metaphase. Pairing of homologous chromosomes: generate new dna that are different from parents, only changing one of the two sister chromatids. Can either make diploid or haploid cells. If cell is diploid, it will make more diploid. If cell is haploid, it will make haploid. Cannot undergo meiosis in haploid, only diploid. Unique dna in daughter cells from parent: three events are unique to meiosis, and all three occur in meiosis i.

Related Questions

Determine whether the following applies to mitosis, meiosis, orboth; also identify the specific stage of cell division thatapplies (e.g. mitosis prophase, meiosis anaphase II, etc)

1) chromosomes pairs line up across the center of the cell

2) sister chromatids seperate

3) spindle fibers separate homologous chromosomes

4) 4 haploid daughter cells are produced

5) a cell 1st undergoes DNA replication

6) chromosomes line up single file across the middle of thecell

7) sister chromatids separate from each other

8) 2 haploid daughter cells form

9) the nuclear membrane re forms

10) spindle fibers attach to pairs of homologous chromosomes

11) the nuclear membrane begins to dissolve

12) centrosomes duplicate

13) synapsis and crossing over occurs

14) 2 diploid daughter cells form

turquoiseporpoise808

Determine if the following events occur during Mitosis, Meiosis I, Meiosis II, Mitosis and Meiosis, Mitosis and Meiosis I, or Mitosis and Meiosis II. (Answers may be used once, more than once or not at all. Be as accurate as possible with your answer.)

___ 1. The chromosome number is reduced by half.

___ 2. The amount of DNA in the cell is twice the amount of a normal diploid cell in G1.

___ 3. DNA is replicated during S phase.

___ 4. Homologous chromosomes separate.

___ 5. Sister chromatids separate.

___ 6. Chromosomes condense and align along the metaphase plate.

___ 7. Homologous chromosomes align and undergo crossing over.

___ 8. Has one round of division per round of DNA replication.

___ 9. The number of chromatids is equal to the number of chromosomes of a diploid cell in G1.

___ 10. Tetrads align on the metaphase plate.

a. Mitosis and Meiosis I only

b. Both Mitosis and Meiosis

c. Meiosis II only

d. Mitosis and Meiosis II only

e. Mitosis only

f. Meiosis I only

coppercattle579

1). If the diploid chromosome number of an organism is 2N=12, how many chromosomes will be found in this organism's sperm?

a).	6 replicated chromosomes

b).	12 replicated chromosomes

c).	6 unreplicated chromosomes

d).	12 unreplicated chromosomes

2). When do homologous chromosomes segregate into two different daughter cells?

a).	fertilization

d).	meiosis II

3). When do sister chromatids segregate into two different daughter cells? (Choose ALL correct answers)

[]

mitosis

[]	fertilization

[]

meiosis I

[]	meiosis II

4). When does crossing over (the formation of chiasmata) occur?

a).

meiosis I

b).	meiosis II

c).

mitosis

d).	fertilization

graypig334

BIOL 130 Lecture Notes - Lecture 24: Escherichia Coli, Sulfur, Bacteriophage

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