car B. car Crossing over B+ car B* car (a) X chromosomes found in Stern's fles and the result of them crossing over Male gametes X chromosome from female B'car Phenotype Bar, car Bcar Bcar Brcar Всoг Y. carnation eyes B'car Brcar B*car B* Round, red car B*car eyes Round, carnation eyes B+ car B'car B*car B'car B'car Всаг Brcar Bcar Bar, red car Bcar eyes (b) The results of Stern's crosses Stern's experiments showing a correlation between recombinant offspring and crossing over. (a) The left side shows the origin found in Stern's female flies. On the top left (all blue chromosome), the x chromosome has a deletion on the left end. On the bottom left (all purple chromosome), a segment of the Y chromosome has been attached on the right end of the x chromosome. The right side shows the results of a crossover. (b) The results obtained by Stern. The female parent carried the two X chromosomes shown on the left side in part (a). The male parent had a normal x chromosome carrying B+ and car and a Y chromosome. x chromosomes Female gametes
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.
In the experiment of Figure shown, Stern followed the inheritance
pattern in which females carried two abnormal X chromosomes
to correlate genetic recombination with the physical exchange of
chromosome pieces. Is it necessary to use a strain carrying two
abnormal chromosomes, or could he have used a strain in which
females carried one normal X chromosome and one abnormal X
chromosome with a deletion at one end and an extra piece of the Y
chromosome at the other end?
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