Q.1. All genes located on the same chromosome
a. form different groups depending upon their relative distance
b. form one linkage group
c. will not form any linkage group
d. form interactive groups that affect the phenotype
(b) All the genes, present on a particular chromosome from a linkage group. The number of linkage group of a species corresponds to the total number of different chromosomes of that species. It is not simply the number of chromosomes in the haploid set,
e.g., in human male=22 pairs of autosomes + 1X-chromosome + 1Y-chromosome
i.e., 24 linkage groups and in female = 22 pairs autosomes + 2X-chromosomes
i.e., 23 linkage groups.
Whie option (a), (c) and (d) are incorrect.