Mutations biology

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#133 Genetic mutations | Biology Notes for A level Mutations Biology, Dihybrid Cross, Biology Revision, Biology Worksheet, A Level Biology, Basic Anatomy And Physiology, Biology Lessons, Genetic Mutation, Biology Notes

A mutation is an unpredictable change in the genetic material of an organism. Gene mutation: change in the structure of a DNA molecule, producing a different allele of a gene. Chromosome mutation: changes in the structure or number of whole chromosomes in a cell. Sources/ mutagens : increase chances of a mutation occuring - random - environmental factors (ionising radiations alpha, beta, gamma; UV radiation; chemicals) Gene mutations Types: base substitution base addition base deletion…

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In order for autosomal recessive disorders to be expressed, offspring generally must inherit two mutations, one from each carrier parent.  Carriers with only one mutation, such as the parents, do not have clinical disease.  Note that carrier parents can expect that 1 in 4 children (25%) will inherit both mutations and have the disorder, 2 in 4 children (50%) will be carriers like their parents, while 1 in 4 children (25%) inherit neither mutation. Nursing Binder, Nurses Life, Color Vision Deficiency, Teeth Diseases, Color Vision, Ap Biology, Biomedical Engineering, Genetic Mutation, Genetic Disorders

This website contains a database of hereditary disorders with important ocular features. It is a point-of-service portal site, designed specifically for clinical ophthalmologists for quick reference during office hours. Each description of a medical condition is linked to another page containing more information written in plain English for patients.

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