Lets go have a look on an example here selected from a public exam paper.... 👀
How should we approach these types of questions? 👆
Here is the key to crack it :
As you can see, whenever the exam is asking you whether the gene/inheritance is sex-linked or not, always always always look up for the "recessive mum" and " her sons". 👨👩👦
And we know the X chromosome of the son IS ALWAYS AND MUST come from his mother.
Hence this would suggest all her "sons" shall CARRY and EXPRESS the recessive allele.
If not, it is not sex-linked. Thats how easy it is! 😉
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