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Home Q & A Board Biology-Related Homework Help General Biology
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dallas99 dallas99
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6 years ago
Create and label a Punnett square to determine the possibility of a couple having a color-blind child if the mother has the recessive trait on one X and the father is color-blind. HINT: Use Xb to indicate an X with the color-blindness trait.

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1.   XbXb -> affected female
2.   XbX -> carrier female
3.   XbY -> affected male
4.   XY -> normal female

Question: What percentage of female offspring will be color-blind? What percentage of male offspring will be color-blind?

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#1
Educator
6 years ago
Hi again,

Good question. I drew something up for you. See if it helps
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#2
Staff Member
6 years ago
Using your notation, the ♀ is XBXb and the ♂ is XbY. The Punnett square is:
_____Xb_____Y___←♂ gametes
XB__XBXb___XBY__
Xb__XbXb___XbY__
↑
♀ gametes

Half the sons and half the daughters will be colorblind.
- Master of Science in Biology
- Bachelor of Science
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#3
3 years ago
Thank you so much for this!
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#4
2 years ago
thank you
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