In a certain taxon of insects, some have 17 chromosomes and the others have 18 chromosomes. The 17 and 18 chromosome-bearing organisms are:
a. males and females, respectively
b. females and males, respectively
c. all males
d. all females
The answer is the option (a) Males and females, respectively
Explanation: Males have single X-chromosomes while females have pairs of X-chromosomes. This is XO sex determination which is seen in such insects. Hence, (a) is the answer.