Meiosis Webquest
Chapter 11.4
1/29/2015
Name ____________________________
WEBSITE
http://highered.mheducation.com/sites/0072495855/student_view0/chapter28/a
nimation__how_meiosis_works.html
Please watch the entire animation (keep volume low enough to hear, yet not
disturb other groups), then replay it, stopping at the end of each slide. If you
have a hard time keeping up, then the text is copied below for each slide. Use
what you learned to complete the questions.
1. What is the name of the cells that are made as a result of meiosis?
______________ and ___________
2. Germ-line cells are somatic cells of the testes that undergo meiosis, and the
new cells resulting from their division are galled gametes or sex cells.
 How many chromosome sets do diploid germ line somatic cells contain? ___
 How many sets of chromosomes do the haploid gametes contain? _____
3. Sperm and egg fuse during ___________________. The new offspring cell
created contains ______ sets of chromosomes, one provided by the ________
and one provided by the _________.
4. For both asexual mitosis and sexual mitosis, _____________ occurs before
the cell begins to divide; this is when the DNA of the cell is doubled to create
sister chromatids.
5. Asexual mitosis only included one division, but sexual meiosis includes
______ divisions, called ___________________ I and meiosis ____.
 After meiosis I, the two new daughter cells still contain paired sister
chromatids, but only one member of each homologous pair is present.
 After meiosis II, the four new daughter cells each contains only one of the
two sister chromatids so the new gametes are termed ____ploid.
6. The 1st stage of meiosis I is __________________.
7. How many pairs of connected sister chromatids are found on the same
spindle fiber during prophase I. ________ In a human, would these
chromosomes on the same spindle both be, for example, chromosome 15, or
could one be chromosome 10 and the other chromosome 15?
_______________________________________________________________
_______________________________________________________________
8. What is the name of the process that lets homologous chromosomes switch
small pieces of DNA to create a totally novel chromosome that was never
present in the somatic germ line cells? _______________________________
9. True or False. _______After meiosis I, the sister chromatids of each pair will
still be identical.
10. True or False. _______ When the germ cells in a person’s sex organs
undergo meiosis I, the homologous chromosomes received from the person’s
mother are always lined up on the top half of the spindle, whereas the
homologous chromosomes from the father are always lined up on the lower half
of the spindle.
11. Sketch the two possible arrangements of a large red (maternal) and large
blue (paternal) pair of sister chromatids on the metaphase I equator of the
spindle.
12. True or false. _______ Independent assortment of homologous
chromosomes onto the spindle during meiosis I results in one end of the spindle
containing only maternally inherited chromosomes, while the other end contains
only paternally inherited chromosomes.
13. True or False. _____During anaphase I of meiosis I, paired sister
chromatids remain connected, but maternally and paternally inherited pairs of
sister chromatids are pulled towards opposite ends of the spindle.
14. After cytokinesis that ends meiosis I, two cells are created, and each of
these contains ______: a) a pair of sister chromatids for both maternally and
paternally inherited versions of each chromosome; b) a pair of sister
chromatids for either the maternally inherited homologous chromosome OR the
paternally inherited homologous chromosome, but not both.
15. Meiosis II looks like mitosis, having these four phases followed by
cytokinesis: _______________________, ________________________,
___________________________, and ___________________________.
However, during meiosis II, only one set of chromosomes is present; that is the
cells are ______________.
16. Because meiosis 1 generated _______ cells, then each of these divided
into two cells, the entire process of meiosis generates _____ haploid cells.
Remember!
Meiosis creates sex cells or gametes
Gametes are haploid
Gametes are unique due to random segregation and independent
assortment of homologous chromosomes, as well as to crossing over.
Before meiosis, the DNA is copied once. But, the cell divides twice, so
gametes have only half as many chromosomes as a somatic cell.