Genetics Crossword

4. The alleles are the same eg. BB or bb
5. An allele that is always expressed if it is present
7. Refers to the way in which characteristics are passed on from one generation to another
13. A feature of an organism that is passed on from one generation to another eg. hair colour, eye colour
14. A substance that can cause a mutation
15. Made up of DNA and contains genes
17. repeating unit found in DNA.
18. A change of a base of DNA
19. A,T,G,C in DNA, A,U,G,C in RNA
21. The alleles are different

1. The difference in individuals within a population of the same species
2. Type of variation where traits can only take a limited number of categories (Eye colour, blood type). Plotted on a bar chart.
3. The trait that is expressed /shown.
6. A type of selection to breeding organisms for particular desirable characteristics that benefit humans
8. The part of the cell that contains genetic material. Controls the cells activity
9. Type of variation where traits can take any numerical value over a large range (height, mass). Plotted on line graph or histogram
10. An individual who does not have an inherited disease but has a single allele for the disease
11. The combination of alleles are present eg. BB or Bb or bb
12. Two copies of this allele must be present for it to be expressed
16. A section of DNA that codes for a trait/protein
20. An alternative form of a gene eg. B or b