If you are conducting controlled crosses while focusing on t

If you are conducting controlled crosses while focusing on two chromosomal loci and you discover that the offspring with parental genotypes are much more frequent than offspring with recombinates, you can then conclude that:: * a. your two loci are linked b. your loci are exhibiting independent assortment c. your loci are segregating independently d. your loci are not linked e. none of the above

Solution

a. your two loci are linked

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 remaining 90% will be identical to the parental genotype. Means, in case of linked genes, the proportion of parental gametes is always higher than the recombinants.