Name: __________________
Date: _______
WHAT SHOULD I KNOW FOR THE MEIOSIS (11-4) QUEST?
Study Guide KEY
QUEST date: __________
Materials to look over:
Meiosis Notes
11-4 ?’s
Do you know Meiosis?
Mitosis/Meiosis Comparison Sheet
Meiosis Vocabulary
Meiosis Starts With?
1) Be able to use vocab words to describe what happens in meiosis. (sister chromatids,
homologous chromosomes, tetrads (synapse), crossing over, independent assortment)
Sister chromatids: identical copies of chromosomes attached to a centromere (X shaped)
Homologous chromosomes: Maternal and Paternal sets of chromosomes (XX)
Tetrads: 4 chromatids crossing over. Synapsis: describes the closeness of the homologous pair
Crossing Over: Exchange of genes between homologous chromosomes in Prophase I
Independent assortment: Random alignment of maternal and paternal chromosomes down the
metaphase plate during Metaphase I.
2) What do haploid and diploid mean? 1n and 2n?
Haploid: one set of each type of chromosome (like only your left shoe) 1n
Diploid: two sets of each type of chromosome (like a pair of shoes) 2n
3) How many chromosomes do humans have in their body cells? In their gametes?
Body cells = 46
Gametes = 23
4) How are sexual and asexual reproduction different?
Sexual: 2 parents, involves meiosis  create unique offspring
Asexual: 1 parent, involves mitosis  creates identical offspring
5) What kind of division do bacteria use to reproduce? (binary fission)
Mitosis - specifically called binary fission when talking about bacteria reproducing
6) WHICH PHASES OF MEIOSIS are different from MITOSIS?
All of Meiosis I
7) LIST DIFFERENCES between mitosis and meiosis.
Mitosis: 2n  2n, Diploid  Diploid, daughter cells identical to parent cells, ONE division
Meiosis: 2n  n, Diploid  Haploid, daughter cells are not identical to parents, TWO divisions
8) For what reasons might a cell use mitosis?
(grow bigger, repair injury, replace worn out cells, DNA overload)
9) For what reasons might a cell use meiosis?
ONLY reason: To make gametes (sex cells: egg and sperm)
10) Complete the table below.
Vocab term
Synapsis
Tetrad
Crossing over
Independent assortment
Definition
Closeness of homologous
chromosomes during crossing
over
4 chromatids of a homologous
pair
Exchange of genes between
homologous chromosomes
Random alignment of maternal
and paternal homologous pairs
down Metaphase plate
When do these occur?
Prophase I
Prophase I
Prophase I
Metaphase I
11) How is spermatogenesis different from oogenesis?
Spermatogenesis creates 4 sperm
Oogenesis creates 3 polar bodies and 1 good egg
12) What are polar bodies? Why do they form? What happens to them?
3 bad eggs that get dissolved after meiosis. They form because the majority of their
cytoplasm containing nutrients, fats, etc. all go into the one good egg.
13) Which is used after fertilization of egg and sperm to grow a baby, meiosis or mitosis?
mitosis
14) Be able to label the following diagram:
chromatid
Chromosomes
Homologous
chromosomes