1: How many chromosomes are there in a normal body cell?

12
23
46
92

2: What kind of cell division makes sex cells?

osmosis
meiosis
ecdysis
mitosis

3: Why do identical twins look so similar?

They have developed from a single fertilized egg
They have developed from two similar eggs
They are born at the same time
They develop in the womb together

4: What is the most likely reason for a 14-year-old girl to be taller than her 14-year-old friend?

She has the same genes as her friend, but eats more
She does exercises which stretch her body
She was born in the summer, but her friend was born in winter
She has inherited genes that make her grow taller

5: Bone is a living tissue. Which kind of cell division allows bones to grow?

ecdysis
mitosis
meiosis
osmosis

6: Lots of things can affect how you grow. Some of these things are inherited. What does 'inherited' mean?

Passed on to you from your brother or sister
Changes in your genes that happen when you grow
Passed on to you from your parents in your genes
How you are brought up

7: Which part of a cell contains genes?

cell membrane
cytoplasm
chromosomes
food store

8: How is a nerve cell adapted to its job?

It has no nucleus
It has a special chemical that carries oxygen around the body
It can move by itself
It has long strands that connect to other nerve cells

9: Why do people have different colour eyes?

Eye colour is determined by your genes
Eye colour depends on how much sunlight there is
Eye colour depends on your diet
Eye colour is always the same as your mother's

10: What sort of tissue is made of cells that can shorten themselves?

blood
muscle
lung
nerve