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Slide 1

Aim: What happens after fertilization?

Aim: What happens after fertilization?

Do Now: Describe the process of fertilization.

A sperm enters an ovum, and the nuclei combine to form one with 46 chromosomes.

Slide 2

Fertilization: Four Major Steps

Fertilization: Four Major Steps

Sperm contacts the egg

Sperm or its nucleus enters the egg

Egg becomes activated and developmental changes begin

Sperm and egg nuclei fuse

Slide 3

Words to know

Words to know

Fuse- to physically join together

Ovum egg cell (female gamete)

Cleavage process of cell division during development

Differentiation the process of forming different kinds of cells from similar cells of the early embryo

Embryo an organism in an early stage of development

Morula solid ball of cells formed from cleavage

Blastula hollow ball of cells formed from cleavage

Gastrula a hollow ball of cells with an in pushing and 3 layers (germ layers)

Slide 4

Fertilization

Fertilization

Slide 5

The Nuclei Fuse Together

The Nuclei Fuse Together

Slide 6

What happens now?

What happens now?

Development of the zygote, the study of which is known as embryology or developmental biology.

The zygote undergoes a series of mitotic cell divisions called cleavage.

The stages of development are: Fertilized ovum (zygote)  2-cell stage  4-cell stage  8-cell stage  Morula  Blastula  Early Gastrula  Late Gastrula

Slide 7

Cleavage (divide via mitosis) forms the 2 cell stage

Cleavage (divide via mitosis) forms the 2 cell stage

Slide 8

They split again to form the 4 cell stage

They split again to form the 4 cell stage

Slide 9

And again to form the 8 cell stage

And again to form the 8 cell stage

Slide 10

And eventually form a Morula

And eventually form a Morula

Slide 11

Next it becomes a blastula

Next it becomes a blastula

Slide 12

And next, a gastrula

And next, a gastrula

Slide 13

The Regents Diagram

The Regents Diagram

Sperm and ovum

Zygote (fertilized ovum)

2-cell stage

4-cell stage

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