Genetics BrainPop Quarter 3
Quarters 2 &3 Brain Pops
Terms in this set (30)
What is the relationship between chromosomes and DNA?
chromosomes are made of DNA
How is the 23rd pair of chromosomes different in boys than it is in girls?
Boys are XY; girls are XX.
Why do chromosomes come in pairs?
One of each pair comes from the mother, the other from the father.
In what crucial way are egg and sperm cells different from other cells in the body?
They only have a single set of chromosomes.
In what way are the 23rd chromosomes of sperm and egg cells different?
Sperm cells contain either X or Y chromosomes; egg cells contain X chromosomes only.
What is a haploid cell?
A cell with half the normal number of chromosomes.
What random factor determines a baby's gender?
Whether the sperm contains an X or Y chromosome.
If a sperm with an X chromosome fertilizes an egg, what are the chances that the offspring is a girl?
What is heredity?
The passing of traits from parents to offspring.
Why is Gregor Mendel considered "The Father of Genetics"?
He was one of the first researchers to establish how heredity worked.
What did Mendel learn about his pea plants?
The tall plant trait dominated the short plant
When two pea plants with Tt genotypes are cross-bred, how many short (tt) plants will there most likely be in the new generation?
25% or 1 out of 4
If a brown-eyed mother and a blue-eyed father have four children, three will probably have brown eyes. What can you conclude from this?
brown eyes are dominant over blue.
How many pair of chromosomes exist in each of your cells?
Why are your chromosomes arranged in pairs?
because you get one from your mother and one from your father.
Besides genetics, what other factors are responsible for how you will grow and develop?
nutrition and environment
Curly hair is dominant, and straight hair is recessive. If a curly-haired man has a baby with a straight-haired woman, what type hair will the baby likely have?
The baby will probably have curly hair.
A double helix looks like
a twisted ladder.
Which of your body's cells contain DNA?
Most of your body's cells
Place the following in order from largest to smallest. A) base pair B) chromosome C) DNA molecule
B, C, A
In the term "nucleic acid", what does the word "nucleic" indicate?
DNA is located in the nuclei
Why do most changes to DNA have no effect at all?
because the changes are quickly repaired
When do random or spontaneous mutations happen?
during cell division
What is the function of the reproductive system?
to create new humans
What happens immediately after sperm leave the testes?
they mix with seminal fluid
How are male reproductive organs different from female reproductive organs?
Male organs are located outside the body; female organs are located inside the body.
What is the function of the uterus?
It's where the fetus develops (grows).
How frequently do ovaries release egg cells?
once a month
Where do eggs travel immediately after they're released from the ovaries?
the fallopian tubes
How many egg cells does a woman produce each day?
NONE; women are born with a lifetime supply.
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