Which of the following conditions correctly d | vedclass

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(B) $1$. In birds,sex determination is of the $ZW-ZZ$ type,where $ZZ$ represents the male and $ZW$ represents the female. Thus,option $A$ is incorrect

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In grasshoppers,the $XO$ type of sex chromosomes determines the male sex.

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(B) $1$. In birds,sex determination is of the $ZW-ZZ$ type,where $ZZ$ represents the male and $ZW$ represents the female. Thus,option $A$ is incorrect.$2$. In grasshoppers,sex determination is of the $XO$ type. Males have only one $X$ chromosome $(XO)$,while females have two $(XX)$. Therefore,the presence of a single $X$ chromosome determines the male sex. Thus,option $B$ is correct.$3$. In humans,the $XO$ condition (Turner syndrome) results in a female phenotype,but these individuals are sterile. However,the standard mechanism for female sex determination in humans is the presence of $XX$ chromosomes. Option $C$ is partially correct in description but $B$ is the standard textbook example for $XO$ sex determination.$4$. In Drosophila,sex is determined by the ratio of $X$ chromosomes to autosomes. $XX$ individuals are female,not male. Thus,option $D$ is incorrect.

Which of the following conditions correctly describes the mechanism of sex determination?

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