Principle of Inheritance and VariationMediumBloom L3
Question
In a certain taxon of insects some have 17 chromosomes and the others have 18 chromosomes. The 17 and 18 chromosome-bearing organisms are
Options
A.males and females respectively
B.females and males, respectively
C.all males
D.all females
Solution
Sol.(a) [Key Concept: XO Sex Determination — Chromosome Count] In certain insects (XO sex determination system — cockroach-like), MALES have XO (ODD chromosome number = 17) and FEMALES have XX (EVEN chromosome number = 18). Males produce two types of sperm: X-bearing (giving XX females) and no-sex-chromosome-bearing O-sperm (giving XO males). So 17-chromosome organisms = MALES (XO) and 18-chromosome organisms = FEMALES (XX). This is the XO sex determination system.
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