Re: Seed Info Wanted
- To: pumpkins@mallorn.com
- Subject: Re: Seed Info Wanted
- From: H* E* P*
- Date: Tue, 27 Apr 1999 10:04:30 -0700
- References:
Mutation Frequency
To Nic and pumpkins list
The mutation frequency is fairly constant at about 1 mutation per base
pair per million generations in all organisms. However, it does vary and
there are "hotspots" that mutate faster. If a gene had 1 million base
pairs, then one mutation per generation would be expected by this very,
very rough rule. However, not all mutations are visible--most are not
visible.
Treasure Your Exceptions
That was the famous saying of a leading geneticist about 80 years ago.
The confusing instances often lead to new discoveries about the way
inheritance works.
Doug Keel has already told me about a cross in which a Pure white seed
line (?) was mated another which might be pure white and tan seed only
was found in one dau that he knows about (contamination can explain
this).
All the fruits on a vine should have the same color seeds. There are
alternative explanations other than mutation; loss of a chromosome is
one remote possibility. I have not yet heard how many chromosomes AG
has. It is always possible the are extra copies of some chromosome (Nic
and Roger have been using colchicine hoping to get extra chromosomes).
Cucurbits normally have 24 chromosomes.
--
Harold Eddleman Ph.D. Microbiologist. i*@disknet.com
Location: Palmyra IN USA; 36 kilometers west of Louisville, Kentucky
http://www.disknet.com/indiana_biolab
---------------------------------------------------------------------
To sign-off this list, send email to majordomo@mallorn.com with the
message text UNSUBSCRIBE PUMPKINS
