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Meiosis - Flashcards

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Class:BIOL 1107L - Essentials of Biology I Lab
Subject:Biology
University:Georgia Southwestern State University
Term:Spring 2011
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Meiosis Takes a diploid nucleus and reduces it to 4 haploid nuclei
Haploid One set of chromosomes
Diploid Two sets of chromosomes
Homologous Chromosomes copies of chromosomes made of the same information
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Recombinant new chromosome combination that is different from what was in the parent chromosomes
In what phase do the homologous chromosomes pair up and crossing over occurs? Prophase I
When does independent assortment of homologous occur? Metaphase I
When do the homologues separate and move toward opposite poles? Anaphase I
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Are the resulting nuclei diploid or haploid at the end of Meiosis 1? Haploid
Are they replicated or unreplicated? Replicated
When do the sister chromatids separate? Anaphase 2
How many daughter cells are at the end of Meiosis 2? 4
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Are they haploid or diploid? Haploid
Are they replicated or unreplicated? Unreplicated
Why is the reduction to haploid from diploid important? A diploid zygote is formed by a haploid sperm cell and a haploid egg cell
What lab was used for Meiosis? Sardoria fimicola
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What event and which phase of Meiosis I would cause the reversal of colors about 50% of the time? Independent Assortment in Metaphase I
How do you find the "% Recombination"? [# of recombinants/(# of recombinants + # of nonrecombinants)] x 100 / 2
How do you find the "# of recombinants"? # of (2:4:2) + # of (2:2:2:2)
How do you find the "# of nonrecombinants"? # of (4:4)
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(4:4) - 195, (2:4:2) - 146, (2:2:2:2) - 139, Total Asci - 480... How did you get % recombinants? Add 2:4:2 and 2:2:2:2. (146+139 = 285) Add 4:4 to the total. ( 285+195 = 480) Divide 285 by 480. (0.593) Multiply 0.593 by 100. (59.3) Divide 59.3 by 2. (29.65) % Recombinants = 30%
What are two ways genetic variability is introduced during Meiosis? Crossing over and random alignment in Prophase I
In Sardoria, what were the haploid daughter cells at the end of Meiosis/Mitosis called? Ascospores
What is the sac that hold them called? Asci
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Why are there 8 of them? Mitosis produces a copy of each cell after Meiosis makes 4 cells
When determining % recomb., you first determine the % and then divided by two. Why? Crossing over between sets
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 MeiosisTakes a diploid nucleus and reduces it to 4 haploid nuclei
 HaploidOne set of chromosomes
 DiploidTwo sets of chromosomes
 Homologous Chromosomescopies of chromosomes made of the same information
 Recombinantnew chromosome combination that is different from what was in the parent chromosomes
 In what phase do the homologous chromosomes pair up and crossing over occurs?Prophase I
 When does independent assortment of homologous occur?Metaphase I
 When do the homologues separate and move toward opposite poles?Anaphase I
 Are the resulting nuclei diploid or haploid at the end of Meiosis 1?Haploid
 Are they replicated or unreplicated?Replicated
 When do the sister chromatids separate?Anaphase 2
 How many daughter cells are at the end of Meiosis 2?4
 Are they haploid or diploid? Haploid
 Are they replicated or unreplicated?Unreplicated
 Why is the reduction to haploid from diploid important?A diploid zygote is formed by a haploid sperm cell and a haploid egg cell
 What lab was used for Meiosis?Sardoria fimicola
 What event and which phase of Meiosis I would cause the reversal of colors about 50% of the time?Independent Assortment in Metaphase I
 How do you find the "% Recombination"?[# of recombinants/(# of recombinants + # of nonrecombinants)] x 100 / 2
 How do you find the "# of recombinants"?# of (2:4:2) + # of (2:2:2:2)
 How do you find the "# of nonrecombinants"?# of (4:4)
 (4:4) - 195, (2:4:2) - 146, (2:2:2:2) - 139, Total Asci - 480... How did you get % recombinants?Add 2:4:2 and 2:2:2:2. (146+139 = 285)
Add 4:4 to the total. ( 285+195 = 480)
Divide 285 by 480. (0.593)
Multiply 0.593 by 100. (59.3)
Divide 59.3 by 2. (29.65)
% Recombinants = 30%
 What are two ways genetic variability is introduced during Meiosis?Crossing over and random alignment in Prophase I
 In Sardoria, what were the haploid daughter cells at the end of Meiosis/Mitosis called?Ascospores
 What is the sac that hold them called?Asci
 Why are there 8 of them?Mitosis produces a copy of each cell after Meiosis makes 4 cells
 When determining % recomb., you first determine the % and then divided by two. Why?Crossing over between sets
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