Lesson 1 | Sexual Reproduction and Meiosis



Name Date Class

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 |Description |

|Prophase I |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. chromosomes separate and ______________________ is pulled toward each end of the cell. |

|Telophase I |8. A nuclear membrane forms around each group of chromosomes. The |

| |cytoplasm divides forming daughter cells. |

| |9. ____________ occurs, splitting the cytoplasm |

|Meiosis II |

|Phase |Description |

|Prophase II |10. Nucleus ______________. ____________ forms. |

|Metaphase II |11. Chromosomes single-file along the middle of the cell. |

|Anaphase II |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 cells form. |

| |15. Each cell has the number of chromosomes |

| |as the original cell. |

Reproduction of Organisms 21

Name Date Class

LESSON 1

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?

Name Date Class

LESSON 1

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.

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