1 / 13

WHAT Creates Unique cells in MEIOSIS ?

WHAT Creates Unique cells in MEIOSIS ?. SYNAPSIS & CROSSING OVER (PROPHASE I) 2. INDEPENDENT/RandomASSORTMENT (Metaphase and Metaphase II). WHAT MAKES MEIOSIS DIFFERENT ?. Homologous chromosomes pair up during ________________ = ______________. PROPHASE I. SYNAPSIS.

cairo-newton
Télécharger la présentation

WHAT Creates Unique cells in MEIOSIS ?

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. WHAT Creates Unique cells in MEIOSIS ? • SYNAPSIS & CROSSING OVER (PROPHASE I) 2. INDEPENDENT/RandomASSORTMENT (Metaphase and Metaphase II)

  2. WHAT MAKES MEIOSIS DIFFERENT ? Homologous chromosomes pair up during ________________ = ______________ PROPHASE I SYNAPSIS This group of FOUR (4) chromatids is called a _________________ TETRAD Images modified from: http://www.emc.maricopa.edu/faculty/farabee/BIOBK/Crossover.gif

  3. WHAT MAKES MEIOSIS DIFFERENT? CROSSING OVER Exchange of DNA betweenhomologous pairs = _____________during PROPHASE I Allows shuffling of genetic material http://www.emc.maricopa.edu/faculty/farabee/BIOBK/Crossover.gif

  4. SEE CROSSING OVERANIMATION Video 5 Video 5 Crossing Over Click the image to play the video segment. 11E

  5. HOMOLOGOUS CHROMOSOMES Image modified by Riedell • SAME SIZE • SAME SHAPE • CARRY GENES for the SAME TRAITS • BUT ______________! (Don’t have to have the SAME CHOICES) NOT IDENTICAL http://sps.k12.ar.us/massengale/genetics%20tutorial.htm

  6. Image modified by Riedell CROSSING OVER • Allows for_________________ in different combinations • After crossing over, chromatid arms are________________ anymore rearranging of DNA NOT IDENTICAL http://sps.k12.ar.us/massengale/genetics%20tutorial.htm

  7. SEGREGATION & CROSSING OVERtogether make even more combinations See ananimation http://waynesword.palomar.edu/lmexer2a.htm

  8. INDEPENDENT ASSORTMENT http://fig.cox.miami.edu/~cmallery/150/mitosis/c13x9independent-assortment.jpg

  9. INDEPENDENT ASSORTMENTat ANAPHASE I Lots of different combinations are possible! This is why you don’t look exactly like your brothers and sisters even though you share the same parents!

  10. http://www.tokyo-med.ac.jp/genet/anm/mimov.gi

  11. WHAT MAKES MEIOSIS DIFFERENT ? 1. Crossing over 2.Independent assortment are ALL ways MEIOSIS results in =______________________________ So daughter cells are ______________ from parents and from each other GENETIC RECOMBINATION different

  12. Why Unique Gametes is a GOOD thing!! Allows for variation in population Individuals can be different Provides foundation for EVOLUTION Allows species to adapt to changes in their environment http://naturalsciences.sdsu.edu/classes/lab8/spindex.html

  13. Random Fertilization • Any egg can be fertilized by any sperm.

More Related