PBS-NOVA: LIFE'S GREATEST MIRACLE MOVIE QUESTIONS AND
ANSWERS. Buy Quality Materials
How many human babies are born each day?
365,000
What is DNA "very good" at?
making copies of itself
What risk is there for a species that only reproduces by cloning?
If one person has a weak immune system, one successful parasite could wipe us all out
How does the DNA of sexually produced offspring compare to the DNA of the
parents?
It is half and half/split
How many sperm are produced by the average human male?
200 million
What process is used to make sperm cells and egg cells?
miosis
What happens to the genes when two chromosomes "embrace"?
They exchange DNA
What is the advantage of diversity within a species?
Better odds that someone will create a new species
When does a human female produce her eggs?
when she is a fetus
*What danger confronts sperm in the vagina?
It is acidic
What does the sperm need in order to be allowed through the egg's zona?
must break through the egg's zona, proteins need to match up
How much time passes between fertilization and the first division of the zygote?
24 hours
After fertilization, how long does it take for the blastocyst to arrive in the uterus?
5 days
What risk does the blastocyst face after it attaches to the uterus?
could be attacked by mothers immune system
True or False: All cells have the same genes
false
What does a gene do when it has been turned on?
something has to come in and loosen some DNA to turn genes on
*Where specifically does the baby get its nutrients from?
plecenta
Does the blood of the mother and the baby ever mix?
no
How old is the fetus when it gains the ability to hear sound?
5 months
What is the main job of the fetus during the last trimester?
to grow
ANSWERS. Buy Quality Materials
How many human babies are born each day?
365,000
What is DNA "very good" at?
making copies of itself
What risk is there for a species that only reproduces by cloning?
If one person has a weak immune system, one successful parasite could wipe us all out
How does the DNA of sexually produced offspring compare to the DNA of the
parents?
It is half and half/split
How many sperm are produced by the average human male?
200 million
What process is used to make sperm cells and egg cells?
miosis
What happens to the genes when two chromosomes "embrace"?
They exchange DNA
What is the advantage of diversity within a species?
Better odds that someone will create a new species
When does a human female produce her eggs?
when she is a fetus
*What danger confronts sperm in the vagina?
It is acidic
What does the sperm need in order to be allowed through the egg's zona?
must break through the egg's zona, proteins need to match up
How much time passes between fertilization and the first division of the zygote?
24 hours
After fertilization, how long does it take for the blastocyst to arrive in the uterus?
5 days
What risk does the blastocyst face after it attaches to the uterus?
could be attacked by mothers immune system
True or False: All cells have the same genes
false
What does a gene do when it has been turned on?
something has to come in and loosen some DNA to turn genes on
*Where specifically does the baby get its nutrients from?
plecenta
Does the blood of the mother and the baby ever mix?
no
How old is the fetus when it gains the ability to hear sound?
5 months
What is the main job of the fetus during the last trimester?
to grow
