Which offspring will receive a harmful allele for an X-linked trait from a man carries the...
Which offspring will receive a harmful allele for an X-linked trait from a man carries the allele?
Homework Answers
Let's examine the X linked inherience with the help of an example - Red - Green colour blindness.
X linked recessive traits that are not relateto feminine characteristics are primarily expressed by men. this is because the men have only one X chromosome. So if a man have an X linked recessive disorder and his mate doesnot carry the allele for it, all of their girls will be carriers. None of his boys will inherit the harmfull allele. ie, only girls will recieve the harfull allele from father. But in the next generation, they (these carrier girls) pass the harmfull allele to thier sons.
Dominant allele - A
Recessive allele - a
| XA | XA | |
| Xa | XAXa | XAXa |
| Y | XAY | XAY |
Hence the effected father passes the trait to their grandsons through his carrier daughter but never to his sons.
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