Determine at what distance (in the morgans) are the genes responsible for the formation of the shape of the eyes (round – strip-like) and eye colors (white – brick-red); the shape of the wings (straight – wavy) and the size of the wings (normal and short). What gene pairs are more likely to cross between? Explain your point of view.
Genes are located on chromosomes in strictly defined places (loci), and allelic genes (responsible for the development of one trait) are located on identical loci of homologous chromosomes. Genes are located in the chromosomes in a linear order, i.e., one after another. Moreover, the farther apart the genes are located on the chromosome, the greater the likelihood that the cross will occur between them. Thus, the crossover frequency is directly proportional to the distance between the genes. Therefore, based on the results of crossbreeding, it is possible to determine this distance, which is measured in relative units — morganides (M). 1 M corresponds to 1% of crossover individuals in the offspring.
It can be seen from the results that crossing over is most likely to occur between the genes of normal wings and short wings, since the crossover frequency is 29%, and the frequency and distance are directly proportional to each other.
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