In most of the higher organisms, the formation of one chiasma actually reduces the probability of another chiasma forming in an immediately adjacent region of the chromosome. This reduction in chiasma formation may be simplistically thought of as being due to a physical inability of the chromatids to bend back upon themselves within certain minimum distances. The net result of this interference is the observation of fewer double-crossover types than would be expected according to map distances. The strength of interference varies in different segments of the chromosome and is usually expressed in terms of a coefficient of coincidence, or the ratio between the observed and the expected double crossovers.
Coefficient of coincidence = % observed double crossovers / % expected double crossovers
Coincidence is the complement of interference.
Coincidence + Interference = 1.0
When interference is complete (1.0), no double crossovers will be observed and coincidence becomes zero. When we observe all the double crossovers expected, coincidence is unity and interference becomes zero. When interference is 30% operative, coincidence becomes 70%, etc.
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About Jonathan G., Biology tutor on Chegg Tutors:
University of Pennsylvania, Class of 2014
Subjects tutored: SAT II Chemistry, Medicine, Basic Science, MCAT, ACT (science), Geometry, College Admissions, Basic Math, Astronomy, Chemistry, Algebra, Environmental Science, Physics, Trigonometry, Resume Writing, Study Skills, Biology, Astrophysics, SAT II Physics, Pre-Calculus, Pre-Algebra, SAT II Biology E/M, and Biochemistry
I have been tutoring since 11th grade in high school in the sciences and math. Throughout college at the University of Pennsylvania, I tutored many students in Physics (General Physics Semesters 1 & 2), General Biology, Molecular Biology, Genetics, Biochemistry, Cellular Biology, Cancer Biology, Physiology, General Chemistry (1 & 2), and Organic Chemistry (1 & 2). I have an extremely strong background in the biological sciences, physical sciences, and math. I currently tutor at the high school and college level. Over the years I have gained experience in adapting to the learning habits of many students. Each student is different and therefore requires a different way of approaching the material. I love helping each student relate to and enjoy even the most difficult subjects in order to make the material easily understood.
I love to relax and enjoy good company. I have a dog whom I love very much. I am a huge soccer fan and play regularly on the weekends. I have been playing the guitar for 15 years. I jog almost every morning. I consider myself to be pretty easy-going. I enjoy watching movies and TV shows. Some of my favorite TV shows are Modern Family, Parks and Rec, The Big Bang Theory, The Office, It's Always Sunny in Philadelphia, Game of Thrones, Sherlock BBC, and The Flash.
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