Name
Date
Class
Key Concept Builder
LESSON 1
Sexual Reproduction and Meiosis
Key Concept What is the order of the phases of meiosis, and what happens in each phase?
Directions: Work with a partner. On each line, write the term or phrase that correctly completes each sentence.
Meiosis I
Phase
Prophase I
Description
1. Chromosomes that are duplicated during _______________wind up to form
______________, which join at the __________ forming a ________________.
2. ______________ forms.
3. The nuclear membrane
.
4. Homologous chromosomes exchange ____________________________.
Metaphase I
5. __________________fibers attach to each pair of _____________
chromosomes.
6. Homologous chromosome align along the
of the cell.
Anaphase I
7.
Telophase I
8. A nuclear membrane forms around each group of chromosomes. The
cytoplasm divides forming
daughter cells.
9. ____________ occurs, splitting the cytoplasm
chromosomes separate
and ______________________ is pulled toward each end of the cell.
Meiosis II
Phase
Prophase II
Metaphase II
Anaphase II
Description
10. Nucleus ______________. ____________ forms.
11. Chromosomes
single-file along the middle
of the cell.
12. Sister chromatids of each duplicated chromosome are
and move
to
.
Telophase II 13. A __________________________ forms around each set of chromatids.
14. The cytoplasm divides, and
15. Each cell has
as the original cell.
Reproduction of Organisms
cells form.
the number of chromosomes
21
Name
Date
Key Concept Builder
Sexual Reproduction and Meiosis
Key Concept Why is meiosis important?
Directions: Answer each question on the lines provided.
1. If a male organism has 40 chromosomes in each body cell, how many chromosomes
does a female of the same species have in each body cell?
2. How many chromosomes would be in a sperm cell and in an egg cell?
3. How many chromosomes would be in an offspring?
5. How many pairs of homologous chromosomes would be in an offspring?
Class
LESSON 1
Name
Date
Challenge
Sequencing Meiosis
The diagrams show the stages of meiosis in scrambled order. To the left of each diagram,
label and sequence the stages in the correct order. To the right of each diagram, include a
brief description of what happens during each stage.
Class
LESSON 1