14. Recombination frequencies between three loci in corn are shown here. Loci Re

Question

14. Recombination frequencies between three loci in corn are shown here. Loci Recombination frequency (%) 17 35 18 R and W2 R and L2 W2 and L2 What is the order of the genes on the chromosome? 15. In German cockroaches, bulging eyes (bu) are recessive to normal eyes (bu), and curved wings (cv) are reces- sive to straight wings (cvt). Both traits are encoded by autosomal genes that are linked. A cockroach has geno- type but bu cvtcv and the genes are in repulsion. Which of the following sets of genes will be found in the most common gametes produced by this cockroach? 19. R. a. but cvt b. bu cv c. but bu d. cv+ cv e. bu cvt DATA na ANALIS AI 50: tio dra gro Explain your answer.

Explanation / Answer

14.  

Gene order R--------------------W2----------------------L2 17 mu 18 mu

15.

Since the genes are repulsive i,e the two linked genes on each chromosome are of different types ( one dominant and one recessive allele, bu+cv or bucv+), and are linked so recombination frequency is less, hence no option a) and b), which are recombinant gamates. Niether option c) and d) are correct because they are the two alleles of the same gene which cannot occur in the single gamate.

Therefore option e) bu+cv is the right answer.   

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