MITOSIS & MEIOSIS

• Where does that first cell come from?

  meiosis and fertilization
• Mitosis produces two identical cells
• How many chromosomes does the human body have?

  46
• What is the result when a maternal and paternal replicates?

  tetrad
• Mitosis produces diploid cells (2n)
• Meiosis produces haploid cells
• Gametes transmit genetic information from the parents to their offspring
• During fertilization the sets of chromosomes will combine to give one diploid cell (2n)
• Meiosis consists of two separate cell divisions
• Exhange of genetic material?

  Crossing over
• What adjoins each strand to the other non-sister chromatid?

  The synaptonemal complex
• Every pair of homologous chromosomes will cross over at least once
• What chromosomes carries genes from two chromosomes?

  recombinant chromosomes
• What phase in Meiosis happens when mitotic spindle forms and the nucleus comes apart?

  Prophase I
• What phase occurs when chromosomes line up?

  Metaphase I
• What phase occurs when the homologous gets pulled apart?

  Anaphase I
• Does the sister chromatids remain together when pulled apart?

  Yes
• Meiosis produces haploid cells that are different from each other and the parent
• What phase occurs when the spindle apparatus forms?

  Prophase II
• The chromosomes align at the metaphase state wherein the sister chromatids are not identical due to crossing over
• In Metaphase II the spindle attaches to the kinetochores
• In Meiosis, we get 4 haploid cells (gametes) each with 23 unduplicated chromosomes
• There are 46 chromosomes in the human body
• when the maternal and paternal replicates it is called a tetrad