Biology Review Unit 6 ANSWRS
Unit 6 – Meiosis
1. Describe what happens in each of the following
a. Prophase I – CHROMATIN CONDENSES INTO CHROMOSOMES, HOMOLOGOUS
CHROMOSOMES PAIR UP, CROSSING OVER OCCURS, SPINDLE FORMS, NUCLEUS
DISAPPEARS
b. Metaphase I – HOMOLOGOUS CHROMOSOMES LINE UP IN THE CENTER OF THE CELL
c. Anaphase I – HOMOLOGOUS CHROMOSOMES ARE PULLED TO OPPOSITE ENDS OF THE
CELL
d. Telophase I – CHROMOSOMES UNCOIL, NUCLEUS RE-FORMS, CELL DIVIDES
e. Prophase II – CHROMATIN CONDENSES INTO CHROMOSOMES, SPINDLE FORMS,
NUCLEUS DISAPPEARS
f. Metaphase II – CHROMOSOMES LINE UP IN THE MIDDLE OF THE CELL
g. Anaphase II – SISTER CHROMATIDS ARE PULLED TO OPPOSITE ENDS OF THE CELL
h. Telophase II – CHROMOSOMES UNCOIL, NUCLEUS RE-FORMS
2. A typical fruit fly body cell has 8 chromosomes, how many chromosomes would a fruit fly sperm
have? 4
3. In meiosis, how many rounds of cell division are there? 2
4. Define homologous chromosomes – TWO CHROMOSOMES, ONE FROM MOTHER, ONE FROM
FATHER, WITH THE SAME GENES (BUT DIFFERENT DNA SEQUENCES)
5. What is asexual reproduction? OFFSPRING COME FROM ONE PARENT
a. Do organisms that reproduce asexually undergo meiosis? NO
6. What is sexual reproduction? OFFSPRING COMES FROM TWO PARENTS
a. Do organisms that reproduce sexually undergo meiosis? YES
7. Why is meiosis called reduction division? THE NUMBER OF CHROMOSOMES IS CUT IN HALF
THROUGH TWO ROUNDS OF CELL DIVISION