Q8: For the four genotypes of the gametes produced by the normal leave, tall pla

Question

Q8: For the four genotypes of the gametes produced by the normal leave, tall plant (MD/md) in Fig. 5.6, which two are recombinants?
e AMottiedCo leaves, dwarf the homologous chronitor example Coupling and Repulsion In crosses for linked genes, th es is cr Normal leaves, tall tance of two genes in the Australiar rina. In this species, one locus deter e outcome of the cross. For thorax: a purple thorax (p) is recessiv orax (p). A second locus detern puparium: a black puparium (b) is brown puparium (b). The loci for th ium color are located close togethe some. Suppose that we test-cross a at both loci with a fly that is homoz Meloses with and wethout crossing over together resultm n less 1han 5096 M D d Because these genes are linked,t arrangements on the chromosom parent. The dominant alleles for brown puparium (b) might resic of the homologous pair, and the re thorax (p) and black puparium on average formation No crossing Nonrecombinant Nonrecombinant Recombinant gametes (100%) gametes (50%) gametes csono This arrangement, in which w on one chromosome and mutan other chromosome, is referred t configuration. Alternatively, one the alleles for green thorax (p) and the other chromosome might thorax (p) and brown pupariumt Fertilization Normal leaves, tall Mottled leaves, dwarf Normal leaves, dwarf Mottled leaves, tall This arrangement, in which one wild-type and one mutant al trans configuration. Whethert parent are in coupling or repulsi types will be most common am When the alleles are in the most numerous progeny types rax and brown puparium and t | black puparium (Figure 5.7a) the heterozygous parent are i ous progeny types are those v puparium and those with puparium (Figure 5.7b). Noti ents in Figure 5.7a and 5.7b a and that the dramatic differ of the progeny in the two c configuration-coupling or r Knowledge of the arrangem mosomes is essential to ac crosses in which genes areli M d -- -- Progeny 8 53 number Nonrecombinant Recombinant Conclusion: With linked genes and some crossing r, nonrecombinant progeny predominate 5.6 Crossing over between linked genes produces nonrecombinant and recombinant offspring. In this testcross, genes are linked and there is some crossing over

Explanation / Answer

Two recombinants are produced

1. Normal leaves,dwarf plant

2. Mottled leaves, tall plant

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