A. What phase or configuration of the genes are the female parents in the cross?

Question

A. What phase or configuration of the genes are the female parents in the cross? B. What is the frequency of recombination between cn and c? C. What is the frequency of recombination between cn and px? D. What is the coefficient of coincidence across this region? E. What is the value of interference? F. Draw a genetic map of the region, showing the locations and correct order of cn, c, and px and the map distances between the genes.
Please show in complete detail. The mutations cinnabr (cn, bright red eyes), curved (c, curved wings), and plexus (px, extra wing veins) are linked in the second chromosome of Drosphila. Use " as the wild-type for each gene. In a cross of cnpxcl+++females and cnpxc/enpxc males, the following progeny were counted: 7) npx c/enpx 296 cn + c/cn px c cn + +/cn px o 63 119 cn px+/cn pxc 10 + +c/cn px c 15 329 a) What phase or configuration of the genes are the female parents in this cross? b) What is the frequency of recombination between cn and c? c) What is the frequency of recombination between cn and px? d) What is the coefficient of coincidence across this region? e) What is the value of the interference? ) Draw a genetic map of the region, showing the locations and correct order of cn, c, and px and the map distances between the genes.

Explanation / Answer

a) Heterozygous

Both the alleles have to be on the linked configurations to obtain all recombinants. The female is heterozygous in configuration and because of which several recombinants are expected. The offsprings obtain both kinds of alleles present in female and male parents leading to both homozygous and heterozygous offspring.

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