Page 83 - Science Course 2 (Book 1)

Mo3-L3a: What is Sexual Reproduction?

SUMMARY
Interphase Pair of homologous
chromosomes in What is Sexual Reproduction?
diploid parent cell
Fertilization occurs when an egg cell and a
sperm cell join together.

Chromosomes
Duplicate
Duplicate pair of
homologous
chromosomes
Sister chromatids Diploid cell with
duplicated
Meiosis I chromosomes

Homologous
chromosomes
separate Mo3-L3b What are the Phases of Meiosis?

KEY CONCEPTS:
Meiosis II Haploid cells with duplicated 1. What is the order of the phases of meiosis, and
chromosomes
what happens during each phase?
2. Why is meiosis important?
2. Sister chromatids
separate.
Vocabulary A-Z
Let us learn some vocabulary
Haploid cells with unduplicated
chromosomes
meiosis
Key Concept a process in which one diploid cell divides to make
What is Sexual Reproduction? four haploid sex cells.

What is Sexual Reproduction?

Let’s Begin

The Phases of Meiosis

In meiosis, one diploid cell divides and makes four
haploid sex cells.

Meiosis occurs only during the formation of sex cells.
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