Genetic diagrams
PICTURE NEEDED
- Created by: chelsey866
- Created on: 08-03-14 19:42
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- Genetic diagrams
- Genetic diagrams show the possible genes of offspring
- 1) Different genes control the development of characteristics e.g. eye colour
- 2) There can be different versions of the same gene. These are called ALLELES
- 3) These alleles give different versions of a characteristics, E.g blue eyes or brown eyes
- 4) You have two alleles for each gene
- 5) Alleles can be dominant or recessive
- 6) If you have two dominant alleles, the dominant characteristic will be shown
- 7) If you have one dominant and one recessive allele, only the dominant characteristic will be shown
- 8) To show a recessive characteristic, both alleles for a gene have to be recessive
- You need to use and understand genetic diagrams
- 1) Imagine you are cross breeding hamsters, and that some behave normally while others do some crazy acrobatics
- 2) Let's say that the allele which causes the crazy behaviour is recessive- so use a 'h'
- 3) and normal behaviour is due to the dominant gene 'H'
- 4) so a crazy hamster must have the alleles 'hh'
- 5) but a normal hamster could be 'HH' or 'Hh'
- 6) There's a 75% chance of having a normal hamster, and 25% chance of a crazy one
- This gives a 3:1 ratio of normal:crazy offspring
- DIAGRAM NEEDED
- Genetic diagrams show the possible genes of offspring
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