Genes and Inheritance II. Revision: most genes come in more than one form (alleles) New alleles are created by mutation and recombination Dominant and recessive properties of an allele determine its effect on the phenotype It’s not always that simple though. Inheritance in families.
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Thanks to Lauren Spence for the photos
Sable Chinchilla Iron grey Himalayan White
Dominance of alleles: C > cch > ch > c
Black (bb, not aa)
Many genes influence the phenotype in a way modified by the environment
Siamese cats again!
Pigment produced because enzyme active in cool parts of body
If you remove some dark fur then put the cat in a warm environment, fur grows back light-coloured
The proportion of individuals carrying the gene that actually show the phenotype is called the “penetrance”