Download Week 11 - Crossroads Academy

 Dr. Whipple
Grade 5 Science
Week 11 – Nov. 7th –Nov. 11th, 2016
In class this week:
• We will continue our first long-term experiment on Lady’s Slipper orchids – our seeds
should be germinating soon!
• We will diagram both mitosis and meiosis and complete a more in depth comparison of how
the two types of cell division are similar and how they are different.
Terms we will begin discussing:
• flowering plants…most of the plants of our planet are flowering plants…angiosperms
• pollen…microspore or male gamete that carries ½ the normal set of chromosomes
• haploid- ½ the normal set of chromosomes
• diploid- two of each chromosome
• chromosome- a strand of DNA and protein that contain hundreds to thousands of genes
• genes- recipes for proteins
• proteins- sequences of amino acids that direct how, when and what happens in a living thing,
functional end result of a gene (technically of gene expression)
• Cell division via mitosis versus meiosis
• homologous chromosomes
• sister chromosomes
• centromere
• alleles
• cell cycle:
§ interphase
§ prophase
§ metaphase
§ anaphase
§ telophase
§ G1, G2, Go
§ S phase
Questions we will be tackling together:
• When do chromosomes line up single file? When do they line up with their homologous
chromosome?
• Are sister chromatids always identical in mitosis? Are they identical in meiosis? Why or
why not?
• Which phase of the cell cycle is the longest? What are the 3 mains parts of this phase? What
happens in each part?
• Why or what happens that makes gametes (pollen, sperm, eggs) genetically different even
though they have the same parents? Do the genes differ or the alleles?
• Which stage of meiosis is most like mitosis?
• What is the major difference between prophase 1 and prophase II in meiosis?
• Do chromosomes line up in a specific order, or randomly?
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Homework
•
Copy over class notes on the night of the day you take them. You should spend 10-15
minutes per day reviewing your notes or instructional lessons.
•
Due by class on Thursday, November 10th, watch the newly posted instructional videos:
§ Mitosis video 1 and 2
§ Meiosis video 1
§ Take notes on these videos – specifically:
1) define (or edit, if necessary, your previous definitions) of the
following terms:
Diploid
Haploid
germline cells
homologous chromosomes
sister chromatids
centromere
gamete
synapsis
recombination
cytokinesis
2) Answer the question: What is the major difference between
prophase 1 and prophase II in meiosis?
3) Write a couple of sentences on how mitosis and meiosis are the
same and a couple sentences as to why (or how) they are different.
•
Homework due Monday November 14th:
§ Review the posted powerpoint “angiosperms: mitosis and meiosis” and
answer the questions on the last slide of the powerpoint. Please rewrite the
question and clearly diagram (and label) your answer.