Two short paper about biology Essay Example | Topics and Well Written Essays - 1500 words

Two short paper about biology - Essay ExampleIf a point mutation changes the fifteenth instal from a U to an A, the resulting sequence is as follows AUG start codon Met/M , ACU Thr/T, CAU His/H, CGC arginine Arg/R ,UGA stop codon (opal), AGU Ser/S, UUA Phe/F, and, CGA Arg/R.If C is inserted between the fourth and fifth bases, the resulting sequence (AUG ACC genus Uca UCG CUG UAG UUU ACG A), will be (Met/M, Thr/T, Ser/S, Ser/S, Leucine (Leu/L), Stop (amber), Phe /F, and Thr/T, respectively. The base A stands alone and has no significance in this case.The insertion of two bases in a row would be more devastating. This is because it will alter the entire sequence by changing the codons, whereas, inserting three bases does not interfere with other codons(Wang, Parrish and Wang).Carriers of a genetic disease ordinarily have one copy of gene mutation and are protected from showing symptoms of the disease, by the presence of a normal gene copy (Feero, Zazove and Stevens). base on knowle dge on possible patterns of inheritance for genetic disorders, it is possible to calculate the worst possible risk of two people conceiving a claw with a genetic disorder, based on their belonging to the Finnish population ( 1 % are carriers of myoclonus epilepsy, MIM 607876).If the gene mutation for MIM 607876 is on a sex chromosome an X-linked recessionary condition requires two people to be carriers of the gene mutation, in order to conceive an affected child. If the two people are carriers of the gene mutation, there is a 50 % chance of conceiving a child with the disease (50/100 *1/100=0.005). X-linked dominant conditions whole occur where individuals have the disease and they require only one genetic mutation to conceive an affected child (Feero, Zazove and Stevens).If the gene mutation for MIM 607876 is on an autosome, two patterns of inheritance are possible. Autosomal dominance