Recombination means that Otwo chromatids have now mutated into one. Oeach chromatid now has a different combination of alleles than it began with. ORNA has carried the genetic message to the ribosome. One of the above.
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In meiosis, the chromatids break and portions of chromatids bearing genes for the same trait are exchanged, or reshuffled, between homologous chromosomes. This is called recombination or crossing over (Figure 2-6). The end result may be that the original chromatids are carrying different alleles at that location. Crossing over allows a great amount of variability to be incorporated into the chromosome. Figure 2-5: The process of recombination. Draw a homologous pair of chromosomes. Use one color (e.g., pink) for one member of the pair and use a second color (e.g., blue) for the second member of the pair.
Madhur L.
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Marisa A.
2. In Figure 3-3 in your textbook we illustrate how sex cells are formed by meiosis. There are two important features of meiosis: a reduction from a diploid to a haploid state, and recombination—the exchange of genetic material between paternally derived and maternally derived chromosomes. A. First, describe recombination. B. Recombination affects linkage and the composition of haplotypes. Alleles are said to be linked if they pass from one generation to the next together, and these “fellow travelers” constitute a haplotype. To illustrate these points let’s look at panel 1 of Figure 3-3. There, alleles A, B, and C are linked because they arrived together in this individual from her father; and likewise alleles A’, B’, and C’ are linked because they arrived together from her mother. Thus, she was born with two different Chromosome 1 haplotypes, the one containing A, B, and C, and the one containing A’, B’, and C’. The rest of Figure 3-3 shows the formation of her gametes (sex cells). When she produced those gametes, why were B and C more likely to remain linked to each other than to A? (Hint: Assume the recombination sites are randomly distributed along the chromosome). C. What happens to haplotypes in every generation, as an inevitable consequence of meiosis?
Josee P.
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