Linked genes always exhibit A: phenotypes that are similar B: recombination frequencies of less than 50% C: homozygosity when involved in a testcross D: a greater number of recombinant offspring than parental offspring when involved in a testcross E: a lack of recombinant offspring when a heterozygous parent is involved in a testcross

中国大学MOOC: A testcross can be used to determine whether an individual is homozygous or heterozygous.