Page 155 - Science Course 3 (Book 1)

The Cell Cycle Mo4-L4a: What is the Cell Cycle?
Lesson 4

Sister Chromatids
two identical chromosomes that make up a
In this topic, you will learn the following duplicated chromosome.
lessons:
Centromere
Mo.4–L4a: What is the Cell Cycle? a structure that hold sister chromatids together.
Mo.4–L4b: What is the Mitotic Phase?
Sister Sister
Chromatids Chromatids

Mo4-L4a What is the Cell Cycle?

KEY CONCEPTS: Centromere
1. What are the phases of the cell cycle?
2. What happens during the interphase cell cycle?

Vocabulary A-Z
Homologous
Homologous
Homologous
Let us learn some vocabulary chromosomes chromosome 1 chromosome 2

Cell Cycle Let’s Begin
a cycle of growth, development, and division that
most cells in an organism go through.
The Cell Cycle
Cycles occur in nature.

The life cycles of living organisms such as trees
are affected by the change in seasons.

Interphase
the period during the
cell cycle of a cell’s
growth and development. Most cells in an organism go through a cycle of
growth, development, and division called the cell
cycle.

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