1. How many chromosomes are there in a human cell?
2. How many chromosomes are there in a fertilised human egg?
3. Which of these factors can not cause genes to mutate?
a) water
b) radiation
c) tobacco
4. How many chromosomes are there in a human egg before fertilisation?
5. What are chromosomes made of?
a) RDA
b) BMI
c) DNA
6. Which of these is not an inherited characteristic?
a) ear without a lobe
b) blue eyes
c) decayed tooth
7. The nucleus of each cell contains a set of chromosomes. True or False?
8. The male chromosome is represented by which two letters?
a) XX
b) XY
c) YY
9. Genetic variation is the result of sexual reproduction. True or False?
10. Choose the correct word to finish this sentence.
Gametes are formed from cells in the reproductive organs by a type of cell division called _____ .
meiosis mitosis mitochondria mutation
