bellwork 2-4-2014
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Bellwork 2-4-2014. Look at the two different populations of organisms below: Which one is asexual and which one is sexual? Which one has variety and which once does not?. A. B. Missed work!!. - PowerPoint PPT PresentationTRANSCRIPT
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Bellwork 2-4-20141. Look at the two different populations of
organisms below:a. Which one is asexual and which one is sexual?b. Which one has variety and which once does not?
A B
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Missed work!!
• If you finish an assignment that was incomplete when I put in homework grades, turn it into the basket!
• All in class work can be completed for full credit! Find a friend in the class if you are missing a lot of work!
• Check grades
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Vocab Review• Chromosome – two chromatids put together, one
complete set of information• Sister chromatids – make up a chromosome, half of
the information • Homologous chromosomes – multiple pairs of
chromosomes (two chromatids each), some from mom and some from dad
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Exploring Meiosis I
• You will be exploring meiosis I on your own with your NEW lab group today
• Following the guidelines at each lab bench, model EACH step of meiosis with the colored beads and chalk
• After each step, YOU MUST GET CHECKED and then draw the step on your worksheet with colored pencils
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Your models
Chromatid Chromosome
Replication **You will have 4 of these in total,all different colors!
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Check your drawings!
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Once you are done…
• Separate sheet of paper• Homework if not done in class…– Describe the steps of meiosis using COMPLETE
SENTENCES
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Bellwork 2-5-2014
1. At which stage in meiosis I does the exchange of information occur?
2. How many cells does meiosis I create?3. Are the products of meiosis I identical or is
there variety?
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Meiosis
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Meiosis: Unit Vocabulary
meiosis tetrad haploid
diploid somatic cell
homologous pair gamete zygote
crossing over Prophase I and II Metaphase I and II
Anaphase I and II Telophase I and II genetic recombination
sexual reproduction asexual reproduction independent assortment
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Meiosis Video
• http://www.youtube.com/watch?v=wrxY4hjMDfk
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How much information?Whole set of DNA = 2n DiploidHalf set =
How to remember:Half – Haploid
Di = 2
n haploid
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How much information?
Talk with your neighbor:Are chromatids haploid or diploid?Are chromosomes (pair of sister chromosomes) haploid or diploid?
n – haploid!
2n – diploid!
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Interphase
Draw and label the centrioles on your Drawing
How much information?2n!! Diploid
DNA replication
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Prophase ITetrads form and crossing over occurs
Label the tetrads in your picture &where crossing over happens
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Prophase INow we have double the amount of information in the cell…n or 2n??2n - Diploid!!!
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Tetrads & Crossing Over
Tetrads – close association of sister chromatids on homologous chromosomes
Crossing Over:Homologous chromosomes exchange small pieces, resulting in new chromosomes!
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Metaphase I
Homologouschromosomes line up at the
metaphase plate
How much info?2n – Diploid!
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Anaphase IHomologous chromosomes move to opposite ends of the cellIndependent assortment occurs creating new combinations!
How much info?2n – Diploid!
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Independent Assortment
Chromosomes from mom & dad RANDOMLY move to one side or the other
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Telophase I
Cell walls begin to pinch inwards
2n – Diploid!How much info?
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(Cytokinesis I)Two daughter cells pinch offTalk to your neighbor…How do they compare to one another?n (haploid) or 2n (diploid?
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Why does genetic recombination matter?
• Your turn!!! You will get two homologous chromosomes with your partner that look like this…
Yellow:
White: Red: Green:
What traits do each potential individuals have?
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Why does genetic recombination matter?
• Cross over at the indicated positions below
Yellow:
White: Red: Green:
Now what traits do each potential individuals have?
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Why does genetic recombination matter?
• Cross over at the indicated positions below
Yellow:
White: Red: Green:
Now what traits do each potential individuals have?
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Prophase IIBeginning with the end products of meiosis IIChromosomes are condensed and prepare for another divisionNo crossing over!!n or 2n?
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Metaphase IIChromosomes line up at the metaphase plateMore similar to mitosis this timeNot homologouspairs any longern or 2n?
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Anaphase II
Chromatids move to either end of the celln or 2n?
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Telophase II
Chromatids separate to individual cellsn or 2n?
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(Cytokinesis)Individual cells formn or 2n?Talk with your neighbor:How do the cells compare to each other?How do they compare to the products of meiosis I?
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What do we call these cells?These cells are called gametes labelEggs in femalesSperm in males n or 2n?They are haploid!!!Get half of information from mom, half from dad
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Fertilization – Making babies!
Sperm + Egg = Zygote
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Mitosis vs. Meiosis
# of divisions:
# of divisions:
Products: Products:
Variety? Variety?
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Meiosis Card Sort
Order the 11 cards to show the progress from a single cell in interphase and progressing to 4 haploid sex cells
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Funny Meiosis Video
• http://www.youtube.com/watch?v=iCL6d0OwKt8
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Slate Quiz!
• Look at the pictures on the following slides & name the stage of meiosis!
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