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QUESTION 1 1 points Save Answer The normal sequence of genes on a certain Drosophia chromosome is 123-45678, where the dot represents the centromere some trut les were found to have aberrant chromosomes with the following structures: Name each type of chromosomal abnormality a) 12347658 Par centri inversion b. Pericentre inversion Deletion d. Translation QUESTION 2 1 points Save Answer The normal sequence of genes on a certain Drosophia chromosome is 123-45678where the dot represents the centromere. Some frutties were found to have aberrant chromosomes with the following structures: Name each type of chromosomal abnormality b) 123-478 Paracentre Inversion b. Per contri inversion O e Delusion d. branslocation

Answer 1

Ans. + Paracentric inversion There are various kinds of chromosomal mutation takes place in different organisms. The mutation alters the structure of chromosome , thus called structural mutation. This types of mutations are - ② Deletion ② Duplication Inversion Trans location Deletion : In this type of mutation a part of chromosome deleted and the remaining part create a new chromosomal structure. Duplication : In this type of mutation a part of chromosome or genes duplicate themselves thus a new structure will be formed. Inversion : If the part of a chromosome suddenly changes its position with its adjacent or distant part, then it is termed inversion. This change takes place by rotation. If in the inversion the centromene part is included then it is pericentric inversion and if centromere part is not included then known as para centric inversion.

Translocation • In this type of mutation shifting or transfer of a part chromosome takes place to its non-homologous soart, then it is termed trans location. In this question 123 -- 45678 is indicated as genes and the dot between them represents centromere. This 123-45678 becomes 123 – 46668. This does not include centromere and changes their position, so it is para centric inversion 2. The 123-45678 becomes 123-478 , so it is deletion] type of chromosomal mutation or abnormality, - The 56 part is deleted thus creates new Chromosomal structure - 123-478