RE: Pumpkin genetics
- To: pumpkins@mallorn.com
- Subject: RE: Pumpkin genetics
- From: Z* B* L*
- Date: Wed, 4 Nov 1998 16:34:20 -0500 (EST)
Hey Bob.
yeah, that is a tough one to explain.
If you cross plant A with plant B. A will be the female from one plant
with different genetics and B will be the male from another plant with
different genetics from A.
YOu will get a pumpkin that looks like A as the female flower confers the
genetics for fruit size and shape. THe seed you harvest from that pumpkin
will be hybrid seed. 1/2 the genetics will be from A and the other half
will be from B. So when you grow a seed from that batch, you will get a
hybrid plant.
You will get female and male flowers. During meiosis when female and male
gametes are made, recombination occurs among chromsomes that are
homologous(crossing over). This will result in haploid gametes that will
be have genetics from A and B. The same occurs from the male flower. you
get recombination between homologous chromosomes and you get a haploid
gamete that is like sperm and will be made up of both A and B. When you
put the pollen on the stigma. YOu are combining the two to get a diploid
fertilization event. The seed will again be diploid , right? Yes.
That seed from the the pumpkin that results from that pollination will be
genetically identical as the seed you used to plant that particular plant.
Right. There has been no new genetics introduced from another plant as you
have inbred this one. You got the male flower from the same plant as the
female flower. Hence, there is no hypothetical plant with C genetics.
Still, you have only A and B making up the genetics.
But now, since recombination has occured, segregation in the seeds
occurred. Your alleles that make up the genes will be in different
combinations than the F1 hybrid plant which is totally uniform. THe new
seed batch will be a mixture of plants that look like the A plant and some
that look like the B plant.
Make Sense. Email back if you have any other questions.
Talk to you soon, Zach
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