NEET 2003 Biology question

In Drosophila, the sex is determined by : -

(1)The ratio of number of X-chromosomes to the sets of autosomesCorrect
(2)X and Y chromosomes
(3)The ratio of pairs of X-chromosomes to the pairs of autosomes
(4)Whether the egg is fertilized or develops parthenogenetically

Answer: (1)

Solution

In Drosophila, Bridges showed that sex is determined by the balance between X chromosomes and sets of autosomes (X : A ratio): a ratio of 1.0 gives a female, 0.5 gives a male, and intermediate values give intersexes -

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Question ID VK-089287