Question

Suppose the F and G genes are on the same chromosome and separated by 75 map units What fraction of the progeny from the cross FG/fg times fg/fg are expected to be Fg/fg? 12.5% 50% 25% 37.5% Two genes cannot be separated by 75 map units.

Answer 1

Suppose the F and G genes are on the same chromosome and separated by 75 map units fraction of the progeny from the cross FGfg fgfg are expected to be Fgjfs a. 12.5% b. 50% C, 25% d. 37.5% Two genes cannot be separated by 75 map units During meiosis, each member of a pair of genes tends to be randomly distributed into gametes (receive alleles) independently of how other chromosomes are distributed. Genes that are having their loci nearer to each other are not generally separated during chromosomal crossover, and are inherited together to the offspring. These genes are known as linked genes (two different chromosomes), and they always have multiple alleles If two linked genes are separated by 10 cM (centi morgans or map units), the percent recombinants produced by this cross is always equal to the 10% and the rema n ng 90% will be identical to the parental genotype. And in case of cross between the linked genes, the highest percent of offspring indicates (always, equal to or more than 50%) the paretnal and the remaining are recombinants Two genes are separated by 75 map units means, the recombinants percent is 7590, which would never occur because the percent of parental gametes is always greater than or equal to 50%