P +/+· +/+· +/+ x _p/p· v/v · b/b Gametes +.+·+ p · v · b a. Determine which genes are linked. b. Draw a map that shows distances in map units. c. Calculate interference, if appropriate. Recombinant for Progeny phenotypes Class F, gametes Numbers p-b p-v v-b gre sen pla pur res bro gre res pla pur sen bro pur res pla gre sen bro gre res bro pur sen pla 1 • +. + 3,210 3,222 1,024 1,044 p • v · +• v. + b R p · + · b p• v +: +· b 4 R 690 R 678 R 7 +• v• b 72 R R 8 p:+· + 60 R R Total 10,000 1,500 2,200 3,436 RRRR
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.
. A three-point testcross was made in corn. The results
and a recombination analysis are shown in the display
below, which is typical of three-point testcrosses (p =
purple leaves, + = green; v = virus-resistant seedlings, +
= sensitive; b = brown midriff to seed, + = plain). Study
the display, and answer parts a through c.
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