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Question
When a human egg is fertilized by a sperm having ‘Y’ chromosome, the zygote has the following combination of chromosomes:
Options
44 + XX
22 + XX
44 + XY
22 + XY
MCQ
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Solution
44 + XY
Explanation:
A human egg always carries an X chromosome, while a sperm may carry X or Y. If a Y-bearing sperm fertilizes the egg, the zygote becomes XY, forming a male. Including autosomes, the total is 44 autosomes + XY.
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