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Question
Write a note on sex linkage.
Solution
- Complete sex linkage:
a. It is exhibited by genes located on non-homologous regions of X and Y chromosomes.
b. They inherit together because crossing over does not occur in nonhomologous regions.
c. Examples of X-linked traits are haemophilia, red-green colour blindness, myopia (near sightedness) and for Y-linked are hypertrichosis, etc. - Incomplete sex linkage:
a. It is exhibited by genes located on homologous regions of X and Y chromosomes.
b. They do not inherit together because crossing over occurs in homologous regions.
c. Examples of X-Y linked traits are total colour blindness, nephritis, retinitis pigmentosa, etc.
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