Principle of Inheritance and VariationEasyBloom L2
Question
Which one of the following conditions correctly describes the manner of determining the sex in the given example?
Options
A.Homozygous sex chromosomes (ZZ) determine female sex in birds.
B.XO type of sex chromosomes determine male sex in grasshopper
C.XO condition in human as found in Turner syndrome, determines female sex.
D.Homozygous sex chromosomes (XX) produce male in Drosophila.
Solution
Sol.(b) [Key Concept: Sex Determination Systems — Grasshopper XO] The correct statement is (b): XO type determines MALE sex in grasshoppers. In grasshoppers (Acrididae), males are XO (one X chromosome, no Y chromosome) and females are XX. Sperm with X give XX females; sperm without sex chromosome give XO males. Option (a) is WRONG — ZZ = MALE in birds (ZW = female). Option (c) is WRONG — XO in humans (Turner syndrome) is female but sterile, not a normal female. Option (d) is WRONG — XX = female in Drosophila.
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