Lesson: Fertilization and Pregnancy Biology

In this lesson, we will learn how to describe the process of fertilization and subsequent embryo development, including an outline of how twins may form.

Lesson Plan

Students will be able to

describe how fertilization occurs,
recall the events that occur when a female becomes pregnant,
outline the stages of embryonic development,
explain the importance of embryonic membranes and the placenta,
outline how dizygotic and monozygotic twins can be produced.

Lesson Presentation

Lesson Video

Lesson Explainer

Lesson Flashcards

Polyspermy
Amniotic fluid
Vagina
Fallopian tubes (oviducts)

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Lesson Worksheet

Q1:

What structure secretes progesterone during the last five months of pregnancy?

Q2:

What is the significance of the acrosome reaction in fertilization?

Q3:

Which feature correctly describes fraternal twins?