Re: Genetics 102
Joe, this selfing brings out any homozygosity in a herterogeneous plant
or keeps the homozygosity in the plant. Selfing will bring out the hidden
recessive gene, and get rid of some of the hetero genes making pure breeding
lines. If a line is selfed for long enough one will have almost all pure
breeding lines.
>From: "Joe Ailts" <Joea@pharmasan.com>
>Reply-To: pumpkins@mallorn.com
>To: <pumpkins@mallorn.com>
>Subject: Genetics 102
>Date: Thu, 15 Dec 1994 16:02:02 -0600
>
>Mr. Elkskin, I appreciate you crawling out of the woodwork. It is my goal
>to encourage more people to become involved.
>
>Your line of thinking is definately headed in the right direction. By
>continually selfing a pumpkin, you increase the chances of producing
>offspring with recessive genes. How is this so? Recessive traits are
>repressed from expression by dominant traits. Here is my purely
>hypothetical situation used for demonstration purposes only...
>
>Let's say Mr. Mombert's 567.5 has a recessive trait for huge pumpkin
>production. Let's also say this is a rare occurence, which not many
>pumpkins have. Soooooooo,,,,,, when you cross this with most other
>pumpkins, which have a dominant trait for average offspring production, the
>dominant trait wins, thus producing an average pumpkin. Now, when you self
>Mr. Mombert's pumpkin, you combine a recessive trait with a recessive
>trait. Since there are no dominant traits involved, the recessive trait
>will be expressed, which in this case is a huge pumpkin.
>
>In real biology, it is much more complicated and with many more factors
>coming into play, but this is the basic idea behind Mendelian genetics.
> The trick is to observe which traits may be recessive, and then cross
>pumpkins with the observed recessive traits with each other.
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