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Bell Work: 2/19/14

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Title: Mitosis process of a cell dividing to produce an exact copy of itself Author: RCS Last modified by: Rutherford County Schools Created Date – PowerPoint PPT presentation

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Title: Bell Work: 2/19/14


1
Bell Work 2/19/14
Work out the Punnett square JUSTIFY YOUR
ANSWER!!!
2
Objectives
  • Classify methods of reproduction as sexual or
    asexual. (SPI 0707.4.1)
  • 65. Asexual vs. Sexual Reproduction

3
Determining the Sex or Gender of Offspring
  • Sex chromosomes carry genes that determine the
    sex or gender of offspring.
  • In humans, females have two X chromosomes and
    males have one X and one Y chromosome.
  • During meiosis, one of each of the chromosome
    pairs ends up in a sex cell.
  • Baby boy XY
  • Baby girl XX
  • Set up a Punnett square to figure out the
    probability of the gender of the offspring.




4
Sex Chromosome Probability
5
Sex ChromosomeChromosome 23 (XX or XY)
xx
6
Living Things Reproduce
  • 2 Types of Reproduction
  • Asexual- a single parent produces an offspring
    identical to the parent
  • Sexual- two parents produce an offspring with
    traits of both parents

7
Challenge Questions
  • When animals go through sexual reproduction, what
    type of cell division are they going through?
  • meiosis
  • When animals go through asexual reproduction,
    what type of cell division are they going
    through?
  • mitosis

8
Types of Asexual Reproduction In Animals
  • Budding happens when a part of the parent
    organism pinches off and forms a new organism.
  • The new organism separates from the parent and
    lives independently.
  • Jellyfish hydra

9
Types of Asexual Reproduction In Animals
  • Fragmentation parts of the organism break off
    (which may or may not be intentional) and a new
    organism grows identical to the parent.
  • Worms starfish

10
Types of Asexual Reproduction In Animals
  • Regeneration organism loses a body part and that
    part may develop into a new organism, or that
    part that was lost may re-develop on the
    organism.
  • Sea star

11
Asexual Reproduction in Other Organisms
  • Binary fission is a method of asexual
    reproduction in which an organism splits into
    two.
  • This occurs in bacteria and other single-celled
    organisms

12
Asexual Reproduction in Plants
  • Some plants can reproduce asexually when they are
    cut or damaged. These plants can sprout new
    growth from their roots, stems, and leaves.
  • In wild strawberry plants, stems are capable of
    arching downward and taking root in the ground,
    resulting in the formation of a new plant. This
    is an example of asexual reproduction.

13
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14
66. Sexual vs. Asexual Lab Stations
  • In your Scienctist Notebook Number 1-16, skipping
    two lines in between each number.
  • At each station there are two scenarios
    (real-world examples) of either sexual or asexual
    reproduction.
  • You and your group will have 2 minutes at each
    station to do the following
  • Classify each method of reproduction in the
    scenario as sexual or asexual reproduction.
  • Justify your answer.
  • The scenarios at Station 8 (lab table 8) will be
    for extra credit, but it is mandatory that you
    try them!
  • We will discuss the scenarios first thing
    tomorrow.
  • When you are finished, you will complete an exit
    ticket comparing and contrasting sexual vs.
    asexual reproduction.

15
Exit TicketCompare Contrast Sexual vs.
Asexual Reproduction using a Venn diagram.
Sexual Reproduction
Asexual Reproduction
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