Answer all the questions.

1. A factor that affects the way that living things develop.

2. Genes control the jobs that a cell does. What do genes carry the code for to do this?

3. Give a type of job that is done by proteins in the body.

4. Type these in the correct order, from smallest to largest - chromosome cell gene nucleus.

(Make sure that you put a space between each word)

5. Give a symptom of Huntington's disorder

6. Is Huntington's disorder caused by a faulty recessive or dominant version of a gene?

7. What name do we use for an alternative version of a gene?

8. Give a symptom of cystic fibrosis.

9. Is cystic fibrosis caused by a recessive or dominant version of a gene?

10. If the version of the gene that causes cystic fibrosis is given by c and the normal version is C, which combination of genes will a carrier have?

11. Which sex chromosomes are in the cells of a human male?

12. Which sex chromosomes are in the cells of a human female?

13. What is the probability that a baby will be female?

14. Which sex chromosome will be in a human sperm cell

15. How many chromosomes will be in a human ovum?

16. How many chromosomes will be in a human liver cell?

17. How many of each chromosome are there in a human brain cell

18. How many of each chromosome are there in a human sperm cell?

19. How many of each gene are there in a human skin cell?

20. What is a genetically identical individual called?