Name: Date:
Student Exploration: Embryo Development
Vocabulary: embryo, embryology, fetus, zygote
Prior Knowledge Questions (Do these BEFORE using the
... [Show More] Gizmo.)
1. The images below show embryos of different species at different stages of development.
Label the images below with 1-4 from least developed to most developed.
A B C D
2. Which image above do you think is a human? Explain.
Gizmo Warm-up
Embryology is the study of the development of embryos from a
single cell to a multicellular fetus. In the Embryo Development
Gizmo™, you will compare the development of different animals
and learn the details of mammalian development. To begin, be
sure the COMPARE tab is selected.
1. What do the images have in common?
Click on the check box to turn on Scale bars and labels. You are observing the zygotes, or
fertilized single cells, of five animals.
2. At this point, are you able to tell which animal is which? Explain.
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Activity A:
Comparative
embryology
Get the Gizmo ready:
Make sure the COMPARE tab is selected and the
Developmental stage slider is on stage 1.
Turn off Scale bars and labels.
Introduction: Comparative embryology compares embryos of different species to gain insight
into how they are related. To provide a framework for this comparison, embryologists divide this
process into 23 Carnegie stages. You will look at seven of these stages in this activity.
Question: Can we use comparative embryology to determine the relatedness of species?
1. Challenge: Drag the labels to the embryos you think they belong to. Fill in the first row of the
table below with your guesses. Then, move the Developmental stage slider one position to
the right, to Carnegie stage 4. Rearrange your labels if necessary and fill in the next row of
the table. Continue until you get to stage 23. Don’t turn on the Reveal answers
check box until the end. (Note: Your guesses may change as you go through the stages.
Don’t worry, they won’t be graded - this is just for fun!)
Stage A B C D E
1
4
8
13
16
20
23
2. Reveal: Click Reveal answers.
A. Did you guess correctly in the end?
B. At which stage were you able to tell which was which?
Explain:
3. Observe: Drag the Developmental stage slider back to stage 8. Turn on Scale bars and
labels. What structure does all of the embryos have in common?
This study source was downloaded by 100000852290574 from CourseHero.com on 11-09-2022 02:03:46 GMT -06:00
https://www.coursehero.com/file/50895560/el-embryodevelopment-bm-docx/
The neural groove will fold into a neural tube and will become the central nervous system. [Show Less]