NEET 2011 Biology question

Which one of the following conditions correctly describes the manner of determining the sex in the given example ?

(1)Homozygous sex chromosomes (ZZ) determine female sex in Birds.
(2)XO type of sex chromosomes determine male sex in grasshopperCorrect
(3)XO condition in humans as found in Turner Syndrome, determines female sex.
(4)Homozygous sex chromosomes (XX) produce male in Drosophila.

Answer: (2)

Solution

In grasshopper the sex determination is of XO type: females are XX and males have a single X chromosome (XO), so (2) is correct. In birds the ZW system operates, where ZZ is male and ZW is female, so (1) is wrong. In humans XO (Turner syndrome) is a chromosomal disorder with

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Question ID VK-090843