Mendel and the gene idea

Genetics as it applies to evolution, molecular biology, and medical aspects.

Moderators: honeev, Leonid, amiradm, BioTeam

Post Reply
deniqua
Garter
Garter
Posts: 10
Joined: Mon Apr 23, 2007 12:52 am

Mendel and the gene idea

Post by deniqua » Wed May 23, 2007 8:10 pm

Two plants are crossed, resulting in offspring with a 3:1 ratio for a particular trait.

Does this mean one parent is dominat and one recessive phenotype such as the purple and white color plants mendel worked with?

My answer is that the parents were true-breeding for contrasting traits but as you may have guess I'm not sure :?:

User avatar
kotoreru
Coral
Coral
Posts: 400
Joined: Thu Apr 12, 2007 9:25 pm
Location: London

Post by kotoreru » Thu May 24, 2007 12:26 am

Yep sounds correct to me...though try to use 'homozygous' instead of true breeding.

Darby
Viper
Viper
Posts: 1278
Joined: Thu Mar 02, 2006 5:29 pm
Location: New York, USA

Post by Darby » Thu May 24, 2007 2:08 pm

The 3-out-of-4 ratio usually indicates a heterozygous dominant-recessive for both parents, if you're doing introductory genetics.

deniqua
Garter
Garter
Posts: 10
Joined: Mon Apr 23, 2007 12:52 am

3:1

Post by deniqua » Thu May 24, 2007 2:16 pm

thanks for your response so you think the both plants were heterozygous?

Darby
Viper
Viper
Posts: 1278
Joined: Thu Mar 02, 2006 5:29 pm
Location: New York, USA

Post by Darby » Fri May 25, 2007 2:14 am

It would give you that ratio.

Post Reply

Who is online

Users browsing this forum: No registered users and 6 guests