With regard to the analysis of chromosome structure, explain theexperimental advantage that polytene chromosomes offer. Discusswhy changes in chromosome structure are more easily detected inpolytene chromosomes than in ordinary chromosomes.
Genetic Variation
Genetic variation refers to the variation in the genome sequences between individual organisms of a species. Individual differences or population differences can both be referred to as genetic variations. It is primarily caused by mutation, but other factors such as genetic drift and sexual reproduction also play a major role.
Quantitative Genetics
Quantitative genetics is the part of genetics that deals with the continuous trait, where the expression of various genes influences the phenotypes. Thus genes are expressed together to produce a trait with continuous variability. This is unlike the classical traits or qualitative traits, where each trait is controlled by the expression of a single or very few genes to produce a discontinuous variation.
With regard to the analysis of chromosome structure, explain the
experimental advantage that polytene chromosomes offer. Discuss
why changes in chromosome structure are more easily detected in
polytene chromosomes than in ordinary chromosomes.
Polytene chromosomes are formed by repeated rounds of DNA replication without any cell division. These commonly occur in the salivary glands of Drosophila although the rest of the insect body contains normal diploid cells.
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