Chromosomes are the thread like structure found in the nuclei of both animal

Chromosomes are the thread like structure found in

This preview shows page 4 - 6 out of 6 pages.

Chromosomes are the thread like structure found in the nuclei of both animal and plant cells. They are made of protein and one molecule of DNA, and contains all of the genetic Kinetochore: a complex of proteins associated with the centromere of a chromosomes during cell division, to which the microtubules of the spindle attack.
Image of page 4

Subscribe to view the full document.

Sister chromatids: The identical copies of DNA attached to other by a centromere Meiosis I 1 diploid cell turns into 2 haploid cells. Introduces variation by combining different genetic information. Starts out like mitosis (interphase) in which the DNA is replicated. Number of chromosomes are even in which half of them belong to the mother and half belong to the father. Prophase I nuclear membrane dissolves, Chromosomes condense, centrioles move to the poles of the cell. Pairs form in chromosomes by overlapping (tetrad). Chromosomal crossover Chiasma (occurs)-point at which two chromosomes meet and switch genetic info. Metaphase I Chromosomes line up in pairs to make a metaphase plate. Microtubules, the spindle fibers of the centrioles, attach to the centromere. Anaphase I Chromosomes begin being pulled apart but only the pairs are being pulled apart from another pair. The sister chromatids stay together, the homologous pairs get pulled apart. Telophase I Chromosomes unravel into chromatin state. Nuclear membrane begins to form. Microtubules dissolve. Cytokinesis occurs Meiosis II Two cells turn into four cells. Following occurs in two haploid cells (gamete: sex cells) at the same time. Interphase II (resting period)
Image of page 5
Prophase II Nuclear envelope dissolves. Chromosomes condense. Centrosomes (are duplicated) move to the opposite sides of the cells. Metaphase II Chromosomes line up to create the metaphase plate. Spindle fibers attached to centrosomes by the kinetochores. Anaphase II Chromosomes are split. Sister chromatids are pulled apart. Telophase II Two cells turn into four cells. Chromatids start to unravel. Nuclear envelope begins to form. Microtubules (spindle fibers) dissolve. The cells do not have homologous chromosomes. They have different genetic info. Cytokinesis occurs.
Image of page 6
  • Fall '19

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern

Ask Expert Tutors You can ask 0 bonus questions You can ask 0 questions (0 expire soon) You can ask 0 questions (will expire )
Answers in as fast as 15 minutes