First Five
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Transcript of First Five
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First Five
1.Complete the chart above.2.Give an example for each term.
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Answers to First Five
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Announcements Nutrition Quiz Retakes:
Correct your quiz Retakes will be available beginning Monday, April 14
Class meetings this week: Maroon: Monday & Friday Gold: Tuesday & Thursday
If you have any Coursework, turn it in TODAY
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TopicsDiploid vs. HaploidMitosis vs. Meiosis
Asexual vs. sexual reproduction
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2 Different types of cellsBODY CELLS (Somatic)
DIPLOID: Have 2 copies of each chromosome: one from mother and one from father 46 total in each body cell
SEX CELLS (Gametes) Examples: sperm and egg cells HAPLOID: Only have 1 copy of
each chromosome 23 in total
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2 Different types of Cell Division
Body Cells (Somatic) Made by MITOSIS
Sex Cells (Gametes) Made by MEIOSIS
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Mitosis• Creates two genetically identical
daughter cells • Chromosome number is maintained by
the exact duplication of chromosomes.
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Inheritance - Meiosis• Half of the genetic information in a
cell is passed on to new cells • When the cells are preparing for
sexual reproduction.– The new cells are called gametes.
•Two types of gametes: egg and sperm
– Meiosis results in genetic variation
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Meiosis• The original cell is diploid and the
daughter cells are haploid.1 diploid cell
4 unique haploid cells
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MITOSIS OR MEIOSIS?
As we go through the following, identify whether the statement is describing mitosis or meiosis and write in the correct column
Mitosis Meiosis
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1) Produces 2 cells
2) Occurs in somatic (body cells)
3) Has 2 separate divisions
4) In humans, produces cellswith 46 chromosomes
MITOSIS OR MEIOSIS?
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1) Produces 2 cells - Mitosis2) Occurs in somatic (body cells)
- Mitosis3) Has 2 separate divisions
- Meiosis4) In humans, produces cells with
46 chromosomes - Mitosis
MITOSIS OR MEIOSIS?
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5) New cells are different from each other
6) Produces new diploid cells
7) Cell divides only once
8) Produces 4 cells
MITOSIS OR MEIOSIS?
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5) New cells are different from each other - Meiosis
6) Produces new diploid cells - Mitosis
7) Cell divides only once - Mitosis
8) Produces 4 cells - Meiosis
MITOSIS OR MEIOSIS?
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9) Produces cells that are identical to each other
10) Produces haploid cells
11) Occurs in sex cells (gametes)
12) In humans, produces cells with 23 chromosomes
MITOSIS OR MEIOSIS?
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9) Produces cells that are identical to each other - Mitosis
10) Produces haploid cells - Meiosis11) Occurs in sex cells (gametes)
- Meiosis12) In humans, produces cells with
23 chromosomes - Meiosis
MITOSIS OR MEIOSIS?
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Quick Review
1)What type of cells does mitosis produce? How many chromosomes are in these cells?
2) What type of cells does meiosis produce? How many chromosomes are in these cells?
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Cambridge Practice Question: Fill-in-the blanks Choose words from the list to complete each of the
spaces in the paragraph. Each word may be used once only and some words are not used all.
Allele diploid dominant gene haploid sexual heterozygous homozygous meiosis mitosis recessive
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Cambridge Practice Question: Fill-in-the blanksAllele diploid dominant gene haploid sexual heterozygous homozygous meiosis mitosis recessive
In humans there is a condition known as cystic fibrosis. This is controlled by a single _1_which has two forms. One form causes cystic fibrosis while the other does not. Gametes are formed by _2_ which produces cells with only one copy of each chromosome, which means that they are _3_. When two humans reproduce, their gametes fuse at fertilization to form a _4_zygote. This is an example of _5_ reproduction.
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Cambridge Practice Question: Fill-in-the blanksAllele diploid dominant gene haploid sexual heterozygous homozygous meiosis mitosis recessive
Neither of the two humans has cystic fibrosis but one of their three children does have the condition. This means that cystic fibrosis is controlled by a _6_allele and that each of the parents is _7_.
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Mitosis and Meiosis are Related to ReproductionMitosis Asexual reproduction One parent makes
offspring that are genetically identical to itself and each other
Processes: Cloning, “budding” (e.g. in yeast), binary fission (e.g. in bacteria)
Meiosis
Sexual reproduction
TWO parents produce unique offspring
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Asexual Reproduction ONE parent produces genetically identical
offspring. There are four main types of asexual
reproduction: Binary Fission Budding Vegetative Propagation Regeneration
http://az.pbslearningmedia.org/resource/tdc02.sci.life.repro.asexual/asexual-reproducers/
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Examples of Asexual Reproduction
Binary fission
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Budding
Examples of Asexual Reproduction
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Vegetative propagation
Examples of Asexual Reproduction
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Regeneration
Examples of Asexual Reproduction
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Benefits of Asexual Reproduction Rapid population growth Requires less energy to reproduce All organisms are capable of reproduction (not
just the females of the species) One organism can make a whole population Less likely to become extinct Each offspring is a genetic copy of the parent
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Disadvantages of Asexual Reproduction The primary disadvantage of asexual
reproduction is:THERE IS NO GENETIC DIVERSITY!
This means that a population of genetically identical organisms is more susceptible to disease and can’t adapt easily to a changing environment.
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Sexual Reproduction Sexual reproduction requires two organisms. Happens when the two gametes (sex cells)
fuse together to create a new and genetically different offspring.
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Stop and JotHow is Meiosis related to
Sexual Reproduction?
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Advantages of Sexual Reproduction Creates more genetic
diversity in the offspring. More adaptability More variation Greater chance of mutation Greater chance of
survivability when faced with environmental change
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Disadvantages of Sexual Reproduction It requires two individuals with opposing
gametes (sex cells). Organisms must use a lot of energy nourishing
and growing a new baby organism.
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Comparing Asexual and Sexual Reproduction
Type ASEXUAL SEXUAL
Number of parents
What do offspring look like?
DNA
One parent 2 parents
Identical to parent
Same as parent
Different from parents but still
similar
Combined DNA of 2 parents
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Asexual
Sexual
+DNA DNA DNA
DNA DNA
Sperm Egg Zygote
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Asexual
Sexual
+DNA DNADNA
DNA DNA
or
DNADNA
DNA
DNA DNA
All offspring identical – no variation
All offspring different – considerable variation
or
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Whiteboard Races
Asexual Sexual
1. Create a Venn Diagram on a large whiteboard2. Fill in as many similarities or differences as you can3. After 3 minutes, groups will rotate and add on to
each new group’s
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Cambridge Practice Problems
This is due on FRIDAY (Maroon) or THURSDAY (Gold)
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Classwork: Reproductive Strategies You will be assigned a group number, 1-6 On a computer, go to the class weebly You and your group will read about two
organisms: one that reproduces sexually and the other asexually
Record information in your table and be prepared to share with the class