السؤال 77

What does one human sperm cell carry at the sex chromosome pair?

Always a Y chromosome
Always an X chromosome
Both an X and a Y chromosome together
Either an X or a Y chromosomeالإجابة الصحيحة

الشرح

The cells that make sperm hold one chromosome of each kind, and each sperm receives just one member of that pair, so about half of all sperm carry each kind. A sperm carrying both would leave the offspring with three sex chromosomes instead of a pair, which is not how gametes are formed.

الشرح

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