Changes in Chromosome Structure and Number An inversion heterozygote has homologous chromosomes with the following linkage arrangements:³ b a ● C f a d e d f b e a. What type of inversion is it? b. Draw the configuration of the chromosomes at synapsis of Prophase I. с g g c. If a four-strand double crossover occurs in the areas c-d (including chromatids 2 and 3) and e-f (including chromatids 1 and 4), what are the meiotic products? d. Repeat for a three-strand double crossover c-d (chromatids 2 and 3), and f-g (chromatids 1 and 3). e. For both types of double crossovers will any of the meiotic products be viable? If so which?
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.
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