BICD 100 Lecture Notes - Lecture 5: White Chicks, List Of Rabbit Breeds, Siamese Cat

• School: UCSD
• Department: Biol/Genetics,Cellular & Develop
• Course: BICD 100
• Professor: Deborah Yelon

Document Summary

Practice midterm questions will be posted on tuesday jan 29. Review session saturday feb 2 at 1 pm. Exam will take place in at least three different rooms. Penetrance: % of mutant population that exhibits a mutant phenotype. Expressivity: range of expression of the phenotype caused by a particular mutation. Incomplete penetrance or variable expressivity can reduce the predictive value of genetic screening. Can be helpful to monitor or advise at risk individuals, even if genotype is not fully predictive. The phenotype of a mutation can depend on environmental conditions. Evening primrose produces red flowers at 23 degrees c and white flowers at 18 degrees c. Siamese cats and himalayan rabbits have darker fur on cooler areas of body (tail, feet, ears) Heterozygotes have both regular red blood cells and sickle cells. Incomplete dominance is when you see something in between having complete phenotypic display of both traits. Multiple genes can contribute to the same trait.