Science Quiz

How many chromosomes do humans have?

• 23

• 22

Answer explanation

Humans have 23 pairs of chromosomes which makes them 46 in total. Chromosomes are small, threadlike structures found inside most cells of any creature or living thing. Chromosomes store information about the organism in units known as genes. When living beings reproduce, they transmit their genes to their children.

What determines if you're a boy or a girl?

• X for Male, Y for Female

• Y for Male, X for Female

Answer explanation

Sex chromosome determines if you're a boy or a girl. In this case, the correct choice is Y for Male, X for Female.

Do you inherit chromosomes from your parents?

• Definitely!

• No way!

Answer explanation

Yes, our parents give us their chromosomes. Chromosomes are passed down from parents to their offspring through sexual reproduction.

Are there some common health problems related to chromosomes?

• Yes

• No

Answer explanation

Some people have health problems because they don’t have the right number of chromosomes or because their chromosomes aren’t working properly. Some examples include Down Syndrome and Turner Syndrome

Can a person's outfit or hairstyle alter their gender?

• Absolutely!

• No way!

Answer explanation

A person's clothes or hair cannot change their gender. Gender is determined by biological and genetic factors.

Can some people be born with more or fewer special chromosomes than usual 46?

• Yes, it's possible

• No, it's not possible

Answer explanation

Yes, some people can be born with more or fewer special chromosomes than the usual 46. This is known as a chromosomal abnormality.

What happens to our chromosomes as we become adults?

• They undergo changes.

• They remain the same.

Answer explanation

Our chromosomes stay the same as we grow up.

How many genes do all the chromosomes in each normal human cell collectively have?

• 1,000,000 to infinity

• 20,000 to 25,000

Answer explanation

The correct answer is 20,000 to 25,000 genes. This is the approximate number of genes found in all the chromosomes of a normal human cell.

Where are chromosomes typically found within a cell?

• In the cytoplasm

• In the nucleus

Answer explanation

Chromosomes are found in the nucleus of cells. They are not located in the cytoplasm. However, keep in mind that the chromosomes only become visible when a cell begins to divide.

How do the boy and girl chromosomes determine our gender?

• Boy and girl chromosomes play rock-paper-scissors to decide our gender.

• Boy and girl chromosomes have a dance-off to determine our gender.

Answer explanation

The boy Y chromosome helps boys grow into boys, and the girl XX chromosomes helps grow girls into girls