genetic diagrams
- Created by: tia5sos
- Created on: 22-11-20 17:35
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- genetic diagrams
- alleles are different versions of the same gene
- most of the time you have two copies of each gene (i.e. two alleles) - one from each parent.
- If the alleles are different, you have instructions for two different versions of a characteristic (e.g freckles or no freckles) but you can only show one version of the two (e.g. freckles).
- The version of the characteristic that appears is caused by the dominant allele. The other allele is said to be recessive. The characteristic caused by the recessive allele only appears if both alleles are recessive.
- in genetic diagrams, letters are used to represent genes. Dominant alleles are always shown with a capital letter (e.g. A) and recessive alleles with a small letter (e.g. a)
- If you are homozygous for a trait you have two alleles the same for that particular gene e.g. CC or cc.
- if you're heterozygous for a trait you have two different alleles for that particular gene, e.g. Cc
- an organism's genotype is the genes and alleles it has and its phenotype is the characteristics that it displays.
- genetic diagrams show the possible alleles in the offspring
- alleles are different versions of the same gene
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