Q.4 Differentiate between complete sex-linkage and incomplete sex-linkage with reference to location of the gene and inheritance.
Best answer
Answer:
| Point | Complete sex-linkage | Incomplete sex-linkage |
|---|---|---|
| Location of gene | On the non-homologous (differential) region of the X or Y chromosome. | On the homologous (pairing) region of the X and Y chromosomes. |
| Inheritance | The genes are inherited together with the sex chromosome and do not cross over; X-linked genes show criss-cross inheritance and Y-linked genes pass from father to son only. | The genes can cross over between X and Y, so they are inherited like autosomal genes (partially sex-linked), e.g. total colour blindness, xeroderma pigmentosum. |
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