DATA 29. MA R. W. Allard and W. M. Clement determined recombination rates for a ANALYSIS series of genes in lima beans (R. W. Allard and W. M. Clement. 1959. Journal of Heredity 50:63–67). The following table lists paired recombination frequencies for eight of the loci (D, Wl, R, S, L, Ms, C, and G) that they mapped. On the basis of these data, draw a series of genetic maps for the different linkage groups of the genes, indicating the distances between the genes. Keep in mind that these frequencies are estimates of the true recombination frequencies and that some error is associated with each estimate. An asterisk beside a recombination frequency indicates that the recombination frequency is significantly different from 50%. Recombination frequencies (%) among seven loci in lima beans WI S Ms G 2.1* 39.3* 52.4 48.1 53.1 51.4 49.8 WI 38.0* 47.3 47.7 48.8 50.3 50.4 51.9 52.7 54.6 49.3 52.6 26.9* 54.9 52.0 48.0 48.2 45.3 50.4 Ms 14.7* 43.1 C 52.0 * Significantly different from 50%.
Genetic Recombination
Recombination is crucial to this process because it allows genes to be reassorted into diverse combinations. Genetic recombination is the process of combining genetic components from two different origins into a single unit. In prokaryotes, genetic recombination takes place by the unilateral transfer of deoxyribonucleic acid. It includes transduction, transformation, and conjugation. The genetic exchange occurring between homologous deoxyribonucleic acid sequences (DNA) from two different sources is termed general recombination. For this to happen, an identical sequence of the two recombining molecules is required. The process of genetic exchange which occurs in eukaryotes during sexual reproduction such as meiosis is an example of this type of genetic recombination.
Microbial Genetics
Genes are the functional units of heredity. They transfer characteristic information from parents to the offspring.
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