السؤال 83

Apart from their part in settling sex, what else is true of the human X and Y chromosomes?

They carry nothing except the information that sets the sex
They are made of a different substance from the other chromosomes
They carry genes for other characteristics, as the other chromosomes doالإجابة الصحيحة
They are copied only when reproductive cells are made and not in ordinary body cells

الشرح

The sex chromosomes are chromosomes like any others, made of long lengths of DNA divided into genes that code for proteins in the usual way. Picturing them as labels that record sex and nothing else would leave a large amount of genetic material in every cell doing no work at all.

الشرح

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