B1 Science: Genes, Chromosomes and DNA
- Created by: Timhudson55
- Created on: 09-05-13 19:57
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- Genes, Chromosomes And DNA
- The Nucleus contains the chromosomes. 46 of them
- Chromosomes are made of genes which are the code for protein
- An allele is two versions of the same gene e.g. the eye colour allele Bb = Brown Eyes as brown is dominant
- Genotypes are the genes an organism has
- A phenotype is the characteristics the organism shows
- Environmental factors can effect the characteristics of a person
- alleles work in Dominant and Recessive qualities
- Dominant only need one allele to be e.g. Huntingtons needs Hh or HH to be diseased
- Recessive need 2 recessive alleles to show e.g. cystic fibrosis needs rr to become diseased. This is why you can be a carrier with Rr
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