NEET Biology question

In a certain taxon of insects, some have 17 chromosomes and others have 18 chromosomes. The 17- and 18-chromosome-bearing organisms are

(A)Males and females, respectivelyCorrect
(B)Females and males, respectively
(C)All males
(D)All females

Answer: (A)

Solution

This describes the XX-XO sex-determination system, in which females carry a complete pair of sex chromosomes (XX, giving an even total chromosome count) while males carry only a single X with no partner (XO, giving an odd total

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Question ID VK-120398