Google Answers Logo
View Question
Q: Genetic Formula ( Answered 5 out of 5 stars,   0 Comments )
Subject: Genetic Formula
Category: Science > Biology
Asked by: jennifer1000-ga
List Price: $2.00
Posted: 06 Oct 2004 12:08 PDT
Expires: 05 Nov 2004 11:08 PST
Question ID: 411141
Brazhyphalangy in man causes shortening of the fingers in the
heterozygous condition and is lethal in the homozygous recessive
condition. If the fene is homozygous dominant, the hands are normal. A
man who has brachyphalangy hands and type A blood has a mother who has
normal fingers and type O blood. He is married to a brachyphalangyed
wife with type B blood who has a mother with type AB blood and a
father with type O blood. How many children would you expect to have
shortening of the fingers and type O blood?
Subject: Re: Genetic Formula
Answered By: librariankt-ga on 07 Oct 2004 07:05 PDT
Rated:5 out of 5 stars
HI again!

I'm calling the fingers trait F and f (because of the blood type, b
would just be confusing!).  This question is tricky because there are
three rather than two blood alleles - A, O, and B.  A and B are equal
to each other but dominant to O - so a type O person must be
homozygous for O.

Man: AO Ff
Woman: BO Ff

So, this is another 4x4 cross.  When you write out each of the
possibilities you'll see that 4 children will have type O blood; 1
will have normal fingers (FF), 2 will have short fingers (Ff), and one
will die (ff).  This is out of 16 possible combinations:

ABFF (1)
ABFf (2)
ABff (1)
AOFF (1)
AOFf (2)
AOff (1)
BOFF (1)
BOFf (2)
BOff (1)
OOFF (1)
OOFf (2)
OOff (1)

- Librariankt
jennifer1000-ga rated this answer:5 out of 5 stars

There are no comments at this time.

Important Disclaimer: Answers and comments provided on Google Answers are general information, and are not intended to substitute for informed professional medical, psychiatric, psychological, tax, legal, investment, accounting, or other professional advice. Google does not endorse, and expressly disclaims liability for any product, manufacturer, distributor, service or service provider mentioned or any opinion expressed in answers or comments. Please read carefully the Google Answers Terms of Service.

If you feel that you have found inappropriate content, please let us know by emailing us at with the question ID listed above. Thank you.
Search Google Answers for
Google Answers  

Google Home - Answers FAQ - Terms of Service - Privacy Policy