Embryonic Development

Lab

Miss School, Miss Out!

Honors Human Biology 5-6

Lab 42

Question: How do the various stages of animal development

compare to one another?

Hypothesis/Prediction: None for this lab.

Procedure: View prepared slides of starfish, pig, and

chicken embryos.

Observations: Take pictures and record the magnification

for the following: zygote, 2-cell, 4-cell, morula, blastula, and

gastrula stages. Make 2 observations for each stage. Label

the ectoderm, endoderm, and mesoderm on the gastrula.

Take pictures of the 48-hour chicken and the 10mm pig

embryos making 5 observations and note 2 similarities for

each. (at least 8 pictures)

Analysis: At what stage does the embryo implant? List the

fate of the ectoderm, endoderm, and mesoderm.

Lab 42 - Embryonic Development Lab

Lab 40 Label Requirements

Star Fish Embryos

1. 2-cell stage

2.4-cell stage

3.blastomere

4.blastula

5.gastrula

6.morula

7.zygote

Blastula

1. blastocoel

Gastrula

1. archenteron

2.blastopore

3.ectoderm

4.endoderm

5.mesoderm

10mm Pig Embryo/48 hour Chicken Embryo

1. heart

2.somites

Star Fish Embryos

1. 2-cell stage

2. 4-cell stage

3. blastomere

4. morula

5. zygote

Star Fish Embryos

1. blastula

2. gastrula

Blastula

1. blastocoel

Gastrula

1. archenteron

2. blastopore

3. ectoderm

4. endoderm

5. mesoderm

10mm Pig Embryo/48 hour Chicken Embryo

1. heart

2. somites

10mm Pig Embryo/48 hour Chicken Embryo

1. heart

2. somites

END

Miss School, Miss Out!