Define the term blastocyst.
Purpose
View the film “Life’s Greatest Miracle” and trace the path of a sperm from its production in the male to fertilization of an egg and subsequent development and birth of a human infant. (CO-1, 2, 3, 5)
Directions
- Access the online film by PBS entitled “PBS Nova The Miracle of Life (1983) [Duration 57:11] (Links to an external site.).” You may also search the Internet for the title of the film if this link is broken or will not open for you.
- Allow sufficient time to view the film. It is almost 1 hour in length.
- Answer the following 20 questions pertaining to the film as you watch.
- As the narrator indicates, making a human is no simple feat. As embryos, we all started off as a single cell. How many cells ultimately complete the human body?
- In what way(s) does bacterial DNA reproduction look different from that of humans? How does this benefit or provide advantages to humans?
- How many new sperm does a man produce per second? Per day? In his lifetime?
- Suggest a reason why a male produces so many sperm.
- What is the name of the process that results in an egg or sperm cell? How does this process generate genetic variety, ensuring no 2 sperm or egg cells are genetically identical?
- Why is genetic diversity a good thing for the human race?
- When do males create sperm cells? When do women create egg cells?
- Once in the fallopian tubes, what is the window of time within which an egg cell must be fertilized or else it will die?
- The typical ejaculate is approximately 1 teaspoon in volume. How many sperm cells is this estimated to contain?
- Is the vaginal environment hospitable to sperm? Why or why not?
- In what way(s) is the female responsible for helping sperm reach their ultimate goal, the egg cell?
- How does a sperm cell get through the outermost barrier of an egg cell, the zona pellucida?
- Even after an egg is fertilized by the sperm, it is estimated that what percentage of all fertilized eggs fail to develop?
- Define the term blastocyst.
- Describe the process of gastrulation.
- If all the cells in our bodies contain the same DNA, why don’t all cells look and function exactly alike? Feel free to use specific examples from the film.
- How does a gene get turned on?
- At what point in development is an embryo referred to as a “fetus, and how big is it at this point?”
- What crucial events take place during the last trimester of development?
- Write a short paragraph which emphasizes something new you have learned from the film.
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