Google Answers Logo
View Question
 
Q: genetic formula ( Answered 5 out of 5 stars,   1 Comment )
Question  
Subject: genetic formula
Category: Science > Biology
Asked by: jennifer1000-ga
List Price: $2.00
Posted: 06 Oct 2004 12:11 PDT
Expires: 05 Nov 2004 11:11 PST
Question ID: 411142
If lethal alleles (alleles that kill) are homozygous and black hair is
dominant over blonde hair, cross a black haired normal person
heterozygous for both traits with a blonde person who is heterozygous
for the normal trait. How many blone offspring will live?
Answer  
Subject: Re: genetic formula
Answered By: librariankt-ga on 07 Oct 2004 06:54 PDT
Rated:5 out of 5 stars
 
Hi Jennifer,

Our lethal allele is L (dominant - harmless) and l (recessive - lethal).
Our hair color allele is B (dominant - black) and b (recessive - blonde).

You have one LlBb person and one Llbb person.

This means that you've got the following possible crosses (with ratios
out of eight possibles):

LLBb (living, black hair) : 1
LLbb (living, blonde) : 1
LlBb (living, black hair) : 2
Llbb (living, blonde) : 2
llBb (dead, black hair) : 1
llbb (dead, blonde): 1

So, three of the blonde offspring will live, for each eight offspring
created.  In this case, since the blonde parent can only contribute a
recessive b allele, you know that all of the offspring will at least
be heterozygous for hair color.  That makes this question trickier
than it could have been.

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

Comments  
Subject: Re: genetic formula
From: netbuster-ga on 06 Oct 2004 12:39 PDT
 
The ratio is 3:1
thats 3 with black hair and 1 with blonde.

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 answers-support@google.com with the question ID listed above. Thank you.
Search Google Answers for
Google Answers  


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