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Principles of Inheritance and Variation
XO type of sex determination in grasshopper
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- XO type of sex determination in grasshopper
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2023 Manipur 1 question
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Select the correct statement/s with respect to mechanism of sex determination in Grasshopper. (A) It is an example of female heterogamety. (B) Male produces two different types of gametes either with or without X chromosome. (C) Total number of chromosomes (autosomes and sex chromosomes) is same in both males and females. (D) All eggs bear an additional X chromosome besides the autosomes. Choose the correct answer from the options given below:In grasshoppers, sex is determined by the XO mechanism: males produce two types of sperm, either bearing an X chromosome or lacking a sex chromosome altogether (B is correct); this is an example of male heterogamety (not female heterogamety; A is incorrect). Since males have one fewer chromosome (XO) than females (XX), the total chromosome number differs between males and females (C is incorrect). All eggs (from XX females) do bear an X chromosome (D is correct, though it's the females producing uniform X-bearing eggs, not stated to be 'additional' beyond the normal complement — matching the source key's selection). So B and D only.